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Difficulty: Hard
Topic: Sampling distribution of sample mean 109. It has been reported that the average time to download the home page from a government
website was 0.9 seconds. Suppose that the download times were normally distributed with a
standard deviation of 0.3 seconds. If random samples of 36 download times are selected, what
is the probability that the sample mean will be less than 0.84 seconds?
A. .1151
B. .4522
C. .8849
D. .5478 AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Sampling distribution of sample mean 1607 Chapter 01  An Introduction to Business Statistics 110. The College Student Journal (December 1992) investigated differences in traditional and
nontraditional students, where nontraditional students are defined as 25 years or older and
working. Based on the study results, we can assume the population mean and standard
deviation for the GPA of nontraditional students is µ = 3.5 and σ = 0.5. Suppose a random
sample of 100 nontraditional students is selected and each student's GPA is calculated. What
is
?
A. 0.5
B. 3.5
C. 7.0
D. 0.05 AACSB: Analytic
Bloom's: Application
Difficulty: Easy
Topic: Sampling distribution of sample mean 111. The College Student Journal (December 1992) investigated differences in traditional and
nontraditional students, where nontraditional students are defined as 25 years or older and
working. Based on the study results, we can assume the population mean and standard
deviation for the GPA of nontraditional students is µ = 3.5 and σ = 0.5. Suppose a random
sample of 100 nontraditional students is selected and each student's GPA is calculated.
Calculated
A. 0.5
B. 3.5
C. 7.0
D. 0.05 AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Sampling distribution of sample mean 1608 Chapter 01  An Introduction to Business Statistics 112. The College Student Journal (December 1992) investigated differences in traditional and
nontraditional students, where nontraditional students are defined as 25 years or older and
working. Based on the study results, we can assume the population mean and standard
deviation for the GPA of nontraditional students is µ = 3.5 and σ = 0.5. Suppose a random
sample of 100 nontraditional students is selected and each student's GPA is calculated. Find
the interval that contains 95.44% of the sample means for nontraditional students.
A. [3.45 3.55]
B. [2.50 4.50]
C. [3.35 3.65]
D. [3.40 3.60] AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Sampling distribution of sample mean 113. The College Student Journal (December 1992) investigated differences in traditional and
nontraditional students, where nontraditional students are defined as 25 years or older and
working. Based on the study results, we can assume the population mean and standard
deviation for the GPA of nontraditional students is µ = 3.5 and σ = 0.5. Suppose a random
sample of 100 nontraditional students is selected and each student's GPA is calculated. What
is the probability that the random sample of 100 nontraditional students have a mean GPA
greater than 3.42?
A. .0548
B. .4364
C. .9452
D. .5636 AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Sampling distribution of sample mean 1609 Chapter 01  An Introduction to Business Statistics 114. The diameter of small Nerf balls manufactured at a factory in China is expected to be
approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08
inches. Suppose a random sample of 20 balls is selected. Calculate the mean of the sampling
distribution of the sample mean.
A. 5.2
B. 0.8
C. 0.08
D. 0.018 AACSB: Analytic
Bloom's: Application
Difficulty: Easy
Topic: Sampling distribution of sample mean 115. The diameter of small Nerf balls manufactured at a factory in China is expected to be
approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08
inches. Suppose a random sample of 20 balls is selected. Calculate the standard deviation of
the sampling distribution of the sample mean.
A. 5.2
B. 0.018
C. 0.08
D. 0.063 AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Sampling distribution of sample mean 1610 Chapter 01  An Introduction to Business Statistics 116. The diameter of small Nerf balls manufactured at a factory in China is expected to be
approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08
inches. Suppose a random sample of 20 balls is selected. Find the interval that contains
95.44% of the sample means.
A. [5.04 5.36]
B. [5.18 5.22]
C. [5.16 5.24]
D. [5.07 5.33] AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Sampling distribution of sample mean 117. The diameter of small Nerf balls manufactured at a factory in China is expected to be
approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08
inches. Suppose a random sample of 20 balls is selected. What percentage of sample means
will be less than 5.14 inches?
A. 0.048%
B. 22.66%
C. 4.8%
D. .00048% AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Sampling distribution of sample mean Chapter 08
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 Winter '14

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