Lesson 4

Question 1

It helps, describes and understands the features of specific data set by giving short summaries about the sample and measures of the data.

Answer 1

Descriptive Statistics

Question 2

two basic categories of measures:

Answer 2

1. Measures of Central Tendency
2. Measures of Variability or Spread

Question 3

Is all around us and everything that we do results in new data.

Answer 3

DATA

Question 4

Are facts and figures collected, analyzed, and summarized for presentation and interpretation.

Answer 4

DATA

Question 5

A characteristic or a quantity of interest that can take on different values.

Answer 5

Variable

Question 6

Is a set of values corresponding to a set of variables.

Answer 6

Observation

Question 7

Is the difference in a variable measured over observations (time, customers, items, etc.)

Answer 7

Variation

Question 8

Types of Data

Answer 8

1. Population and Sample Data
2. Quantitative and Categorical Data
3. Cross-Sectional and Time Series Data
4. Sources of Data

Question 9

A representative sample can be gathered by

Answer 9

random sampling

Question 10

numeric and arithmetic operations such as addition, subtraction, multiplication, and division, can be performed on them

Answer 10

Quantitative Data

Question 11

If arithmetic operations cannot be performed on the data

Answer 11

Categorical Data

Question 12

are collected from several entities at the same, or approximately the same, point in time.

Answer 12

Cross-Sectional Data

Question 13

are collected over several time periods.

Answer 13

Time Series Data

Question 14

Two sources of data

Answer 14

1. Experimental Study
2. Non-experimental or Observational Study

Question 15

It is often useful to create a frequency distribution for a data set.

Answer 15

1Frequency Distributions for Categorical Data

Question 16

summary of data that shows the number of observations in each of several non-overlapping classes, typically referred to as bins, when dealing with distributions.

Answer 16

Frequency Distribution

Question 17

2 creating distribution from data

Answer 17

1. Frequency Distributions for Categorical Data
2. Frequency Distributions for Quantitative Data

Question 18

The three steps necessary to define the classes for a frequency distribution with quantitative data are:

Answer 18

1. Determine the number of non-overlapping bins.
2. Determine the width of each bin.
3. Determine the bin limits.

Question 19

A common graphical presentation of quantitative data. This graphical summary can be prepared for data previously summarized in either a frequency, a relative frequency, or a percent frequency distribution.

Answer 19

Histograms

Question 20

A variation of the frequency distribution that provides another tabular summary of quantitative data is the blank, which uses the number of classes, class widths, and class limits developed for the frequency distribution.

Answer 20

Cumulative Distribution