Test Bank For Introduction to Probability and Statistics, 15th Edition by William Mendenhall, Robert Beaver, Barbara Beaver.

TEST BANK Introduction to Probability and Statistics 15/E William Mendenhall
Chapter 01 - Describing Data with Graphs

1. A variable is a characteristic that changes or varies over time, and/or for different individuals or objects under
consideration. An experimental unit is the individual or object on which a variable is measured.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

2. Bar and pie charts are graphical techniques for qualitative data. The former focus the attention on the
frequency of the occurrences of the categories, and the later emphasize the percentage of occurrences of each
category.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

3. In a sample of 1000 students in a university, 125 of them or 12.5% are biology majors. The 12.5% is an
example of statistical inference.
a. True
b. False
ANSWER: False
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

4. Individual observations within each class may be found in a frequency distribution.
a. True
b. False
ANSWER: False
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

5. Twenty-five percent of a sample of 200 professional tennis players indicated that their parents did not play
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,Chapter 01 - Describing Data with Graphs

tennis. This is an example of descriptive statistics as opposed to inferential statistics.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

6. A local cable system using a sample of 1000 subscribers estimates that fifty percent of its subscribers watch
premium channel at least five times per week. This is an example of inferential statistics as opposed to
descriptive statistics.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

7. Statistical inference is the process of making an estimate, prediction, or decision about a population based on
sample data.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

8. In the term "frequency distribution," frequency refers to the number of data values or measurements falling
within each class.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

9. A branch of the statistics discipline that is used to develop and utilize techniques for effectively presenting
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,Chapter 01 - Describing Data with Graphs

numerical information is called inferential statistics.
a. True
b. False
ANSWER: False
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

10. A branch of the statistics discipline that is used to develop and utilize techniques for properly making
inferences about population characteristics from information contained in a sample drawn from this population
is called inferential statistics.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

11. Persons or objects that have characteristics of interest to statisticians are called variables.
a. True
b. False
ANSWER: False
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

12. A qualitative variable about which observations can be made in only two categories is a bivariate data set.
a. True
b. False
ANSWER: False
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

13. A variable that is normally described in words rather than numerically is a qualitative variable.
a. True

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b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

14. A discrete quantitative variable is one that can assume values only at specific points on an interval of
values, with inevitable gaps between them.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

15. A continuous quantitative variable is one that can assume values at all points on an interval of values, with
no gaps between possible values.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

16. Persons or objects on which an experiment is performed are called experimental units.
a. True
b. False
ANSWER: True
POINTS: 1
QUESTION TYPE: True / False
HAS VARIABLES: False
DATE CREATED: 2/4/2019 3:06 AM
DATE MODIFIED: 2/4/2019 3:06 AM

17. Groupings of data, created to enhance an understanding of them, usually by making the groups collectively
exhaustive and mutually exclusive are called classes or categories.
a. True
b. False

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