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When testing a null hypothesis about a single

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Unformatted text preview: etimes C. Never AACSB: Reflective Thinking Bloom's: Comprehension Difficulty: Hard Topic: Hypothesis testing 79. If a one-sided null hypothesis is rejected at a given significance level, then the corresponding two-sided 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 1-784 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 1-785 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 mail-order 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 1-786 Chapter 01 - An Introduction to Business Statistics 85. A mail-order 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 1-787 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 over-the-counter 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.

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