UNIT 2-3

Question 1

The process of preparing data for analysis by removing or modifying incorrect, incomplete, irrelevant, duplicated, or improperly formatted data

Answer 1

Data Cleaning

Question 2

T/F: In importing data, you may not change the type, role, and name of each attribute (variable)

Answer 2

FALSE

Question 3

Many different string values

Answer 3

Polynomial

Question 4

Exactly two values

Answer 4

Binomial

Question 5

A fractional number

Answer 5

Real

Question 6

A whole number

Answer 6

Integer

Question 7

Indicator for date and time

Answer 7

date_time

Question 8

Indicator for date without time

Answer 8

date

Question 9

Indicator for time without date

Answer 9

time

Question 10

It is an operation in RapidMiner which has criteria and retains data depending on the given criteria

Answer 10

Filtering

Question 11

Instead of filtering, you may remove all cases with missing values using the ______________, instead of add filters

Answer 11

Condition Class

Question 12

To remove “white spaces” in the encoding, use the ______ operator

Answer 12

TRIM

Question 13

It is the graphical representation of data; Techniques used to communicate insights from data through visual representation

Answer 13

Data Visualization

Question 14

T/F: Data Visualization is used to distill large datasets into visual graphics to allow for easy understanding of complex relationships within the data and analyze massive amounts of information and make data-driven decisions

Answer 14

TRUE

Question 15

What are the common visualization techniques

Answer 15

Bar graph, Line graph, Pie graph, Histogram, Scatterplot, Boxplot, Heatmap

Question 16

Used to compare counts, percentages, or other measures (average) for different discrete categories of data

Answer 16

Bar graph

Question 17

In using bar graph in RapidMiner, set the group by ______ and use the _________ aggregate function

Answer 17

Stage; Average

Question 18

T/F: Further customization of the title, axes range, font, etc. may be done on your own

Answer 18

TRUE

Question 19

It is used to observe trend

Answer 19

Line graph

Question 20

It shows the relative contribution that different categories contribute to an overall total

Answer 20

Pie graph

Question 21

It is the frequency distribution of continuous attribute

Answer 21

Histogram

Question 22

T/F: Histogram presents categorical attribute while bar graph represents numerical attribute

Answer 22

FALSE

Question 23

T/F: Bar graphs have spaces between bars, while histograms do not

Answer 23

TRUE

Question 24

T/F: In histogram, check the reverse axis to keep the order of the values

Answer 24

FALSE

Question 25

It plots two numerical attributes

Answer 25

Scatterplot

Question 26

It is the graphical representation of the quartiles

Answer 26

Boxplots

Question 27

It is a graphical representation of data where the individual values contained in a matrix (map) are represented as colors

Answer 27

Heatmap