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C. Never AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Hard
Topic: Hypothesis testing 79. If a onesided null hypothesis is rejected at a given significance level, then the
corresponding twosided null hypothesis (i.e., the same sample size, the same standard
deviation, and the same mean) will _________ be rejected at the same significance level.
A. Always
B. Sometimes
C. Never AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Hard
Topic: Hypothesis testing 1784 Chapter 01  An Introduction to Business Statistics 80. Type II error is defined as the probability of ________________ H0, when it should
___________.
A. failing to reject; be rejected
B. failing to reject; not be rejected
C. rejecting, not be rejected
D. rejecting, rejected AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Topic: Type I or Type II error 81. For the following hypothesis test where H0: µ ≤ 10 vs. Ha: µ > 10, we reject H0 at level of
significance α and conclude that the true mean is greater than 10 when the true mean is really
8. Based on this information we can state that we have:
A. Made a Type I error
B. Made a Type II error
C. Made a correct decision
D. Increased the power of the test AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Topic: Type I or Type II error 82. For the following hypothesis test where H0: µ ≤ 10 vs. Ha: µ > 10, we reject H0 at level of
significance α and conclude that the true mean is greater than 10 when the true mean is really
14. Based on this information we can state that we have:
A. Made a Type I error
B. Made a Type II error
C. Made a correct decision
D. Increased the power of the test AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Topic: Type I or Type II error 1785 Chapter 01  An Introduction to Business Statistics 83. A major airline company is concerned that its proportion of late arrivals has substantially
increased in the past month. Historical data shows that on the average 18% of the company
airplanes have arrived late. In a random sample of 1,240 airplanes, 310 airplanes have arrived
late. If we are conducting a hypothesis test of a single proportion to determine if the
proportion of late arrivals has increased: What is the value of the calculated test statistic?
A. Z = 6.416
B. Z = 3.208
C. Z = 3.208
D. Z = 6.416
E. Z = 1.833 AACSB: Analytic
Bloom's: Application
Difficulty: Hard
Topic: Hypothesis testing 84. A mailorder business prides itself in its ability to fill customers' orders in less than six
calendar days, on average. Periodically, the operations manager selects a random sample of
customer orders and determines the number of days required to fill the orders. On one
occasion when a sample of 39 orders was selected, the average number of days was 6.65 with
a sample standard deviation of 1.5 days. Calculate the appropriate test statistic to test the
hypotheses.
A. 2.71
B. 16.90
C. 0.65
D. 2.71
E. 3.31 AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Hypothesis testing 1786 Chapter 01  An Introduction to Business Statistics 85. A mailorder business prides itself in its ability to fill customers' orders in less than six
calendar days, on average. Periodically, the operations manager selects a random sample of
customer orders and determines the number of days required to fill the orders. On one
occasion when a sample of 39 orders was selected, the average number of days was 6.65 with
a sample standard deviation of 1.5 days. What is the critical value for α = .10 to test the
hypotheses.
A. 1.28
B. 1.96
C. 2.33
D. 1.28
E. 1.96 AACSB: Analytic
Bloom's: Comprehension
Difficulty: Easy
Topic: Hypothesis testing 86. A random sample of 80 companies who announced corrections to their balance sheets
took a mean time of 8.1 days for the time between balance sheet construction and the
complete audit. The standard deviation of these times was 1.3 days. If the claim is that the
population mean is greater than 7.5 days, calculate the appropriate test statistic to test the
hypotheses.
A. 4.13
B. 36.92
C. 4.71
D. 4.71
E. 4.13 AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Hypothesis testing 1787 Chapter 01  An Introduction to Business Statistics 87. A random sample of 80 companies who announced corrections to their balance sheets
took a mean time of 8.1 days for the time between balance sheet construction and the
complete audit. The standard deviation of these times was 1.3 days. What is the critical value
for α = .001 to test the claim that µ is greater than 7.5 days.
A. 2.575
B. 3.09
C. 1.96
D. 2.575
E. 3.09 AACSB: Analytic
Bloom's: Comprehension
Difficulty: Easy
Topic: Hypothesis testing 88. The manufacturer of an overthecounter heartburn relief mediation claims that its product
brings relief in less than 3.5 minutes, on average. To be able to make this claim the
manufacturer was required by the FDA to present statistical evidence in support of the claim.
The manufacturer rep...
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This document was uploaded on 01/20/2014.
 Winter '14

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