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CompTIA Data+ DAO-001 Certification Guide > 16 Practice Exam One > Flashcards

16 Practice Exam One Flashcards

1
Q

What does a practice exam provide?

A

A good idea of what material you know well and what material you may need to review.

It simulates the experience of taking the actual exam.

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2
Q

What is the average time per question in a 90-minute exam with 90 questions?

A

1 question per minute.

This requires efficient time management during the exam.

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3
Q

Which option would be most appropriate for delivering a dashboard only once on a specific date?

A

D. Scheduled delivery

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4
Q

A schema with denormalized tables is what type of schema?

A

C. Star schema

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5
Q

What is the result of a right join on two tables?

A

Includes all records from the right table and matched records from the left, filling with NULLs where no match exists.

This is typical behavior of right joins in SQL.

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6
Q

What represents the count of observations that falls into each category?

A

D. Frequency

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7
Q

Forecasting falls into what general type of analysis?

A

D. Trend analysis

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8
Q

Which analytical tool is considered a programming language?

A

B. Python

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9
Q

A person’s credit card information is considered what type of protected data?

A

C. PCI

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10
Q

What type of report is most appropriate to determine the relationship between an employee’s height and productivity?

A

D. An ad hoc report

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11
Q

Which of the following contains the true mean?

A

A. The confidence interval

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12
Q

When creating a new dashboard, what should be done first?

A

D. Create a mockup/wireframe

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13
Q

What visualization is appropriate for showing revenue from each division and department?

A

C. A stacked bar chart

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14
Q

What does updating a table by adding new values to the bottom exemplify?

A

D. Active record

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15
Q

What type of error does a dataset with incorrect formatting represent?

A

D. Invalid data

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16
Q

What type of visualization is best for explaining complicated relationships to a non-technical audience?

A

C. Infographic

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17
Q

What does ETL stand for?

A

B. Extract, transform, load

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18
Q

Which section of a data use agreement includes information on what happens if consent is withdrawn?

A

C. Data deletion

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19
Q

Which schema is most appropriate for a database requiring the fewest number of joins?

A

B. A star schema

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20
Q

What type of data error is characterized by having the same information recorded multiple times?

A

A. Duplicate data

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21
Q

When checking for data quality, which factor is important?

A

C. Data accuracy

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22
Q

What data validation approach should be taken to see if analysis results can be generalized?

A

D. Cross-validation

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23
Q

What type of analysis gives basic information about the shape and structure of data?

A

C. Exploratory data analysis

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24
Q

What is the alternative hypothesis when comparing two product designs?

A

B. There is a significant difference between Design A and Design B

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25
Q

What type of analysis is requested to check KPIs for schedule adherence?

A

B. Performance analysis

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26
Q

What is the variance of the dataset 56, 46, 27, 31, 40?

A

C. 112.8

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27
Q

Using the independent variable to predict the dependent variable describes what analysis?

A

B. A simple linear regression

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28
Q

What type of distribution is represented by a bell curve?

A

A. Normal

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29
Q

Which factor directly impacts the speed and efficiency of a dashboard?

A

B. Interactive saved searches

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30
Q

Which file type is used to pass data through websites without structural dependencies?

A

A. JSON

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31
Q

What is the mean of the dataset 39, 37, 42, 39, 43?

A

B. 39

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32
Q

What data storage solution is most appropriate for large amounts of unstructured data?

A

B. Data lake

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33
Q

What analysis is appropriate to compare two baseball athletes’ batting records?

A

A. Correlation

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34
Q

What variables are appropriate data content for a report on robot performance?

A

B. Date, Vol, Res, Distance(m), and RobotWeight(lb)

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35
Q

What analysis compares a sample to the population for representation?

A

B. T-test

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36
Q

What data quality dimension ensures data is reported in the same format?

A

C. Consistency

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37
Q

What type of report gives customer-facing agents the most up-to-date customer information?

A

C. A dynamic report

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38
Q

What is defined by having rows and columns in a database?

A

B. Defined rows/columns

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39
Q

Which values will change when updating an old report with new data?

A

C. The reference dates

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40
Q

What should be the first consideration when choosing fonts for a report?

A

D. Branding

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41
Q

What type of report is appropriate for the sales department needing access to the latest sales data?

A

C. A self-service report

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42
Q

What type of deletion involves removing an entire row of data due to one value?

A

B. Listwise deletion

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43
Q

What is code or software that provides information about the environment called?

A

A. System functions

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44
Q

What are if, and, or, and not examples of?

A

D. Conditional operators

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45
Q

What is the process of filling gaps in data with average values called?

A

C. Imputation

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46
Q

What kind of visualization is represented by a waterfall chart?

A

A. A waterfall chart

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47
Q

Under what circumstances should you check the quality of your data?

A

A. Data transformation

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48
Q

What type of correlation is depicted when values move in the same direction?

A

C. Positive correlation

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49
Q

What analysis is appropriate to compare your exam results to classmates’ scores?

A

C. Z-score

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50
Q

What type of data is characterized by a lack of structure?

A

A. Unstructured

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51
Q

What business requirement should be considered when making a report for a manager with little experience?

A

C. Filters

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52
Q

How much has the average number of clicks per minute increased since last year if the average was 12.8 this year and 8.7 last year?

A

B. 38%

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53
Q

What type of report are compliance reports generally considered?

A

C. A recurring report

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54
Q

What is redundant data?

A

A. The same information recorded in multiple columns

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55
Q

What was the average number of clicks per minute calculated last year?

A

8.7

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56
Q

How much has the average number of clicks per minute increased since last year?

A

A. 35%

Options include A. 35%, B. 38%, C. 47%, D. 52%

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57
Q

Compliance reports are generally considered what type of report?

A

C. A recurring report

Options include A. An ad hoc report, B. A research report, C. A recurring report, D. A self-service report

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58
Q

What is redundant data?

A

A. The same information recorded in multiple columns

Options include A. The same information recorded in multiple columns, B. Data that is incomplete or blank, C. The same information recorded in multiple rows, D. Data that does not meet formatting requirements

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59
Q

What type of distribution does the following visualization represent?

A

A. Normal

Options include A. Normal, B. Uniform, C. Non-parametric, D. Exponential

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60
Q

An IP address is considered what type of protected data?

A

A. PII

Options include A. PII, B. PHI, C. PCI, D. PIFI

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61
Q

In a simple AB study, which p-value would cause you to reject the null hypothesis assuming an alpha of 0.05?

A

D. 0.008

Options include A. 0.3, B. 0.5, C. 0.06, D. 0.008

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62
Q

If you had a variable called BirdCount that kept track of the number of birds that flew by your window on a specific day, what variable type would it be?

A

D. Discrete

Options include A. Nominal, B. Continuous, C. Ordinal, D. Discrete

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63
Q

The act of automatically collecting, processing, and storing online transactions is called what?

A

D. OLTP

Options include A. OLAP, B. ETL, C. ELT, D. OLTP

64
Q

Breaking large chunks of data down into small, usable pieces is called what?

A

B. Parsing

Options include A. Interpretation, B. Parsing, C. Reduction, D. Interpolation

65
Q

A new variable that specifically holds a calculation of other variables is called what?

A

A. A derived variable

Options include A. A derived variable, B. A binary variable, C. A variable deletion, D. An ordinal variable

66
Q

What analysis is most appropriate to determine if a sample accurately reflects the larger population of customers?

A

C. The chi-square goodness of fit

Options include A. The chi-square test for independence, B. The chi-square test for homogeneity, C. The chi-square goodness of fit, D. The chi-square test for linearity

67
Q

What type of analysis would be most appropriate to determine the connection between customer age and purchase likelihood?

A

C. Link analysis

Options include A. Trend analysis, B. Performance analysis, C. Link analysis, D. Exploratory data analysis

68
Q

What is the most appropriate visualization to track ROI over the past 4 years?

A

A. A line chart

Options include A. A line chart, B. A scatter plot, C. A heat map, D. A bubble chart

69
Q

Where on a dashboard do you put instructions for how to use it?

A

C. The FAQs

Options include A. The appendix, B. The cover page, C. The FAQs, D. The reference dates

70
Q

What conclusion can you draw from the following visualization?

A

B. Administration is the smallest department

Options include A. This accounts for every employee in the company, B. Administration is the smallest department, C. Administration is the biggest department, D. There are at least 60 employees in the company

71
Q

What kind of visualization does the following graph represent?

A

C. A pie chart

Options include A. A waterfall chart, B. A scatter plot, C. A pie chart, D. A bubble chart

72
Q

A data point that is so much smaller than every other data point that it drastically lowers the average is an example of what?

A

C. An outlier

Options include A. A specification mismatch, B. Duplicate data, C. An outlier, D. Data type validation

73
Q

Which section of a data use agreement includes information on the consequences of using the data improperly?

A

A. The acceptable use policy

Options include A. The acceptable use policy, B. Data processing, C. Data deletion, D. Data retention

74
Q

What type of join is represented by the following example?

A

B. Inner Join

Options include A. Outer join, B. Inner Join, C. Left Join, D. Right Join

75
Q

When is an ideal time to implement MDM?

A

C. When a company is purchased

Options include A. When data is manipulated, B. When data is transferred, C. When a company is purchased, D. When data is transformed

76
Q

Which variable indicates that a row is the most recent value?

A

B. Active Record

Options include A. Magic Number, B. Active Record, C. Active Start, D. Active End

77
Q

A large data storage solution for relational data, focusing on efficiency and following a snowflake schema, would most likely be what?

A

A. A data warehouse

Options include A. A data warehouse, B. A data mart, C. A data lake, D. A data puddle

78
Q

What concept does the following dataset exemplify?

A

C. Dummy coding

Options include A. Recoding a number into a category, B. Recoding a category into a number, C. Dummy coding, D. Transposition

79
Q

What is the range of the following dataset: 25, 38, 50, 49, 38?

A

C. 40

Options include A. 25, B. 38, C. 40, D. 50

80
Q

What type of database schema does the following diagram represent?

A

A. A snowflake schema

Options include A. A snowflake schema, B. A star schema, C. A galaxy schema, D. A fast constellation schema

81
Q

What type of access requirement is it if a database can only be accessed by people with the job title data analyst?

A

C. Role-based

Options include A. Data encryption, B. User group-based, C. Role-based, D. Data transmission

82
Q

How do you interpret a p-value of 0.4 in a study about a memory-enhancing drug assuming an alpha of 0.05?

A

B. Reject the alternative hypothesis and accept the null hypothesis

Options include A. Accept the alternative hypothesis and reject the null hypothesis, B. Reject the alternative hypothesis and accept the null hypothesis, C. Accept the alternative and null hypotheses, D. Reject the alternative and null hypotheses

83
Q

What is a prewritten query that allows the user to enter specific information to target data?

A

C. Filter

Options include A. Index, B. Parameterization, C. Filter, D. Sort

84
Q

What do you call the process of checking the data type of a variable to avoid errors?

A

A. Data type validation

Options include A. Data type validation, B. Imputation, C. Specification mismatch, D. Interpolation

85
Q

What sort of connection does a piece of code that requests information from an API and waits for a response have?

A

C. Synchronous

Options include A. Structured, B. Unstructured, C. Synchronous, D. Asynchronous

86
Q

What sort of cardinality do the following tables have? Employee Information and Sales Information

A

B. One-to-many

Options include A. One-to-one, B. One-to-many, C. Many-to-many, D. There is no entity relationship

87
Q

Which data validation approach should you take to see whether a dataset is appropriate for a specific goal?

A

C. Data profiling

Options include A. Reasonable expectations, B. Data audits, C. Data profiling, D. Cross-validation

88
Q

What conclusion can you draw from the following visualization?

A

C. The taller you are, the more likely you are to have a larger hat size

Options include A. Being taller makes your head bigger, B. Having a small head makes you taller, C. The taller you are, the more likely you are to have a larger hat size, D. The taller you are, the more likely you are to have a smaller hat size

89
Q

A WAV file holds what type of information?

A

C. Audio

Options include A. Image, B. Video, C. Audio, D. Text

90
Q

What is the process of using code to automatically collect data from websites called?

A

A. Web scraping

Options include A. Web scraping, B. Web services, C. Non-relational, D. Semi-structured

91
Q

What type of data is the following dataset an example of?

A

C. Both structured and relational

Options include A. Structured, B. Relational, C. Both structured and relational, D. Neither structured nor relational

92
Q

Which of the following is a key process of MDM?

A

C. Data transformation

Options include A. Data dictionary, B. Data encryption, C. Data transformation, D. Data manipulation

93
Q

What action has been performed on a dataset in the following depiction?

A

A. Filtering

Options include A. Filtering, B. Subsets, C. Parameterization, D. Sorting

94
Q

What type of error occurs if you wrongly conclude that a software update made a program faster?

A

A. Type I

Options include A. Type I, B. Type II, C. Type III, D. Type IV

95
Q

What is the answer to the question regarding interactive saved searches?

A

Interactive saved searches

Review Chapter 12, Reporting Process – Understanding Report Delivery

96
Q

What data format is mentioned in relation to data structures?

A

JSON

Review Chapter 2, Data Structures, Types, and Formats – Going through Data Types and File Types

97
Q

What is the value given in relation to measures of central tendency?

A

40

Review Chapter 7, Measures of Central Tendency and Dispersion – Understanding Measures of Central Tendency

98
Q

What type of data storage is referred to as a data lake?

A

Data lake

Review Chapter 2, Data Structures, Types, and Formats – Understanding the Concept of Warehouses and Lakes

99
Q

Which statistical test is mentioned?

A

T-test

Review Chapter 10, Introduction to Inferential Statistics – Understanding t-Tests

100
Q

What are the variables listed related to reporting?

A

Date, Distance(m), and RobotWeight(lb)

Review Chapter 12, Reporting Process – Knowing what to Consider when Making a Report

101
Q

What statistical test is associated with the term chi-square?

A

Chi-square

Review Chapter 10, Introduction to Inferential Statistics – Knowing Chi-Square

102
Q

What concept is described as consistency in data quality?

A

Consistency

Review Chapter 15, Data Quality and Management – Understanding Quality Control

103
Q

What type of report is described as dynamic?

A

A dynamic report

Review Chapter 11, Types of Reports – Distinguishing Static and Dynamic Reports

104
Q

What defines structured data?

A

Defined rows/columns

Review Chapter 2, Data Structures, Types, and Formats – Understanding Structured and Unstructured Data

105
Q

What are reference dates in reporting?

A

The reference dates

Review Chapter 12, Reporting Process – Understanding Report Elements

106
Q

What aspect of reporting is related to branding?

A

Branding

Review Chapter 12, Reporting Process – Designing Reports

107
Q

What is a self-service report?

A

A self-service report

Review Chapter 11, Types of Reports – Knowing about Self-Service Reports

108
Q

What method is used to deal with missing data?

A

Listwise deletion

Review Chapter 4, Cleaning and Processing Data – Dealing with Missing Data

109
Q

What functions are used in data shaping?

A

System functions

Review Chapter 5, Data Wrangling and Manipulation – Shaping Data with Common Functions

110
Q

What type of operators are used in data manipulation?

A

Conditional operators

Review Chapter 5, Data Wrangling and Manipulation – Shaping Data with Common Functions

111
Q

What technique is used to fill in missing data?

A

Imputation

Review Chapter 4, Cleaning and Processing Data – Dealing with Missing Data

112
Q

What type of chart is described as a stacked bar chart?

A

A stacked bar chart

Review Chapter 13, Common Visualizations – Comprehending Charts with Bars

113
Q

What process is involved in data quality management?

A

Data transformation

Review Chapter 15, Data Quality and Management – Understanding Quality Control

114
Q

What correlation type is mentioned?

A

Positive correlation

Review Chapter 10, Introduction to Inferential Statistics – Calculating Correlations

115
Q

What statistic measures standard deviations from the mean?

A

Z-score

Review Chapter 8, Common Techniques in Descriptive Statistics – Understanding z-Scores

116
Q

What type of data structure is referred to as relational?

A

Relational

Review Chapter 2, Data Structures, Types, and Formats – Understanding Structured and Unstructured Data

117
Q

What are views in reporting?

A

Views

Review Chapter 12, Reporting Process – Knowing what to Consider when Making a Report

118
Q

What percentage is mentioned in relation to descriptive statistics?

A

47%

Review Chapter 8, Common Techniques in Descriptive Statistics – Calculating Percent Change and Percent Difference

119
Q

What is defined as a recurring report?

A

A recurring report

Review Chapter 11, Types of Reports – Understanding Recurring Reports

120
Q

What is described as the same information recorded in multiple columns?

A

The same information recorded in multiple columns

Review Chapter 4, Cleaning and Processing Data – Managing Duplicate and Redundant Data

121
Q

What type of data is referred to as non-parametric?

A

Non-parametric

Review Chapter 4, Cleaning and Processing Data – Understanding Non-parametric Data

122
Q

What does PII stand for?

A

PII

Review Chapter 14, Data Governance – Understanding Data Classifications

123
Q

What is the p-value in hypothesis testing mentioned?

A

0.008

Review Chapter 9, Hypothesis Testing – Learning p-Value and Alpha

124
Q

What type of data is described as discrete?

A

Discrete

Review Chapter 2, Data Structures, Types, and Formats – Going through Data Types and File Types

125
Q

What does OLTP stand for?

A

OLTP

Review Chapter 3, Collecting Data – Understanding OLTP and OLAP

126
Q

What process involves parsing data?

A

Parsing

Review Chapter 5, Data Wrangling and Manipulation – Parsing Your Data

127
Q

What is referred to as a derived variable?

A

A derived variable

Review Chapter 5, Data Wrangling and Manipulation – Calculating Derived and Reduced Variables

128
Q

What test is known as the chi-square goodness of fit?

A

The chi-square goodness of fit

Review Chapter 10, Introduction to Inferential Statistics – Knowing Chi-Square

129
Q

What type of analysis is mentioned as link analysis?

A

Link analysis

Review Chapter 6, Types of Analytics – Finding Links

130
Q

What type of chart is described as a line chart?

A

A line chart

Review Chapter 13, Common Visualizations – Charting Lines, Circles, and Dots

131
Q

What is the cover page in reporting?

A

The cover page

Review Chapter 12, Reporting Process – Understanding Report Elements

132
Q

What statement is made about the number of employees in a company?

A

There are at least 60 employees in the company

Review Chapter 13, Common Visualizations – Comprehending Charts with Bars

133
Q

What type of chart is described as a bubble chart?

A

A bubble chart

Review Chapter 13, Common Visualizations – Charting Lines, Circles, and Dots

134
Q

What is an outlier in data analysis?

A

An outlier

Review Chapter 4, Cleaning and Processing Data – Finding Outliers

135
Q

What policy is related to acceptable use in data governance?

A

The acceptable use policy

Review Chapter 14, Data Governance – Knowing Use Requirements

136
Q

What type of join is mentioned?

A

Inner join

Review Chapter 5, Data Wrangling and Manipulation – Merging Data

137
Q

What occurs when a company is purchased?

A

When a company is purchased

Review Chapter 15, Data Quality and Management – Understanding Master Data Management (MDM)

138
Q

What is referred to as active record?

A

Active Record

Review Chapter 2, Data Structures, Types, and Formats – Updating Stored Data

139
Q

What is defined as a data warehouse?

A

A data warehouse

Review Chapter 2, Data Structures, Types, and Formats – Understanding the Concept of Warehouses and Lakes

140
Q

What coding technique is referred to as dummy coding?

A

Dummy coding

Review Chapter 5, Data Wrangling and Manipulation – Recoding Variables

141
Q

What is the calculated range and quartiles value mentioned?

A

25

Review Chapter 7, Measures of Central Tendency and Dispersion – Calculating Range and Quartiles

142
Q

What type of schema is referred to as a star schema?

A

A star schema

Review Chapter 2, Data Structures, Types, and Formats – Going through the Data Schema and its Types

143
Q

What is described as role-based in data governance?

A

Role-based

Review Chapter 14, Data Governance – Understanding Data Security

144
Q

What decision is made regarding the null hypothesis?

A

Reject the alternative hypothesis and accept the null hypothesis

Review Chapter 9, Hypothesis Testing – Learning p-Value and Alpha

145
Q

What process is referred to as parameterization?

A

Parameterization

Review Chapter 3, Collecting Data – Optimizing Query Structure

146
Q

What is the term for validating data types?

A

Data type validation

Review Chapter 4, Cleaning and Processing Data – Understanding Invalid Data, Specification Mismatch, and Data Type Validation

147
Q

What is described as synchronous in data collecting?

A

Synchronous

Review Chapter 3, Collecting Data – Utilizing Public Sources of Data

148
Q

What type of relationship is referred to as one-to-many?

A

One-to-many

Review Chapter 14, Data Governance – Handling Entity Relationship Requirements

149
Q

What process is involved in validating data quality?

A

Data audits

Review Chapter 15, Data Quality and Management – Validating Quality

150
Q

What statement is made about height and hat size?

A

The taller you are the more likely you are to have a larger hat size

Review Chapter 13, Common Visualizations – Charting Lines, Circles, and Dots

151
Q

What type of data is referred to as audio?

A

Audio

Review Chapter 2, Data Structures, Types, and Formats – Going through Data Types and File Types

152
Q

What method is used for collecting your own data?

A

Web scraping

Review Chapter 3, Collecting Data – Collecting Your Own Data

153
Q

What type of data structure is both structured and relational?

A

Both structured and relational

Review Chapter 2, Data Structures, Types, and Formats – Understanding Structured and Unstructured Data

154
Q

What is a data dictionary?

A

Data dictionary

Review Chapter 15, Data Quality and Management – Understanding Master Data Management (MDM)

155
Q

What process is referred to as sorting?

A

Sorting

Review Chapter 3, Collecting Data – Optimizing Query Structure

156
Q

What type of error is defined as Type I?

A

Type I

Review Chapter 9, Hypothesis Testing – Understanding Type I and Type II Error

CompTIA Data+ DAO-001 Certification Guide (17 decks)

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