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Managerial Statistics International Edition 9th Edition by Gerald Keller - Test Bank
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,CHAPTER 1 SECTION 1: WHAT IS STATISTICS?TRUE/FALSE
1. The significance level measures the proportion of the time an inference about a population will be
correct in the long run.
ANS: F PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
2. A summary measure that is computed from a sample is called a statistic.
ANS: T PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
3. The confidence level is the proportion of times that an estimating procedure will be wrong in the long
run.
ANS: F PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
4. A resort employs 3,500 managers and staff. To ascertain their employees' opinions of a proposed
health insurance plan, 350 employees are surveyed at random. The proportion of the 350 employees
who favor the health insurance plan represents a parameter in this scenario.
ANS: F PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
5. In a sample of 350 students selected from a large college of business, 25% are found to be marketing
majors. The 25% is a statistic.
ANS: T PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
6. 35% of a sample of 300 professional baseball players indicated that their parents did not play baseball.
Based on this sample, we estimate that approximately 35% of the parents of all professional baseball
players did not play baseball, plus or minus 5%. This is an example of using inferential statistics.
ANS: T PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
7. A population is the group of all items of interest to a statistics practitioner.
ANS: T PTS: 1 REF: SECTION 1.1
© 2012 Cengage Learning. All Rights Reserved. This edition is intended for use outside of the U.S. only, with content that may be different
from the U.S. Edition. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.
, NAT: Analytic; Statistical Inference
8. A statistic is typically a known quantity while a parameter is typically an unknown quantity.
ANS: T PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
9. Statistical inference is the process of making an estimate, prediction, or decision about a population
based on sample data.
ANS: T PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
10. A descriptive measure of a population is called a parameter.
ANS: T PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
11. A descriptive measure of a sample is called a parameter.
ANS: F PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
12. You take a random sample to estimate a population mean and your results have a confidence level of
80%. That means the process you used will give you correct results 80% of the time.
ANS: T PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
MULTIPLE CHOICE
13. A random sample of 100 students is taken at LearnAll University and it’s found that their average GPA
is 3.1. If this information is used to help estimate the average GPA for all students at LearnAll
University, which branch of statistics was applied?
a. Descriptive statistics
b. Inferential statistics
c. Sample statistics
d. Population statistics
ANS: B PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
© 2012 Cengage Learning. All Rights Reserved. This edition is intended for use outside of the U.S. only, with content that may be different
from the U.S. Edition. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.
, 14. A company has developed a new computer microprocessor whose average lifetime is unknown. In
order to estimate this average, 300 microprocessors are randomly selected from a large production line
and tested; their average lifetime is found to be 7 years. The 300 microprocessors represent a:
a. parameter.
b. statistic.
c. sample.
d. population.
ANS: C PTS: 1 REF: SECTION 1.1
NAT: Analytic; Statistical Inference
© 2012 Cengage Learning. All Rights Reserved. This edition is intended for use outside of the U.S. only, with content that may be different
from the U.S. Edition. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.
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