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# Seven workers from this crew were selected at random

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Unformatted text preview: What do you conclude? A. Reject the null hypothesis, p-value = .0352 B. Fail to reject the null hypothesis, p-value = .004 C. Reject the null hypothesis, p-value = .004 D. Fail to reject the null hypothesis, p-value = .0352 Number of observations > 1.00 = 1 Number of observations < 1.00 = 7 AACSB: Analytic Skills Bloom's: Application Difficulty: Hard Learning Objective: 1 Topic: Sign Test 1-1850 Chapter 01 - An Introduction to Business Statistics 84. The claim of the manufacturer of cell phone batteries is that the median life of a battery is more than 40 hours. Suppose a random sample of 75 batteries finds that 32 have a life of more than 40 hours. State the null hypothesis to test the claim. Assume that the population of all battery lives is not normally distributed. A. H0: Md ≥ 40 B. H0: Md ≠ 40 C. H0: Md > 40 D. H0: Md ≤ 40 H0: Md ≤ 40 vs HA: Md > 40 AACSB: Reflective Thinking Bloom's: Comprehension Difficulty: Medium Learning Objective: 1 Topic: Sign Test 85. The claim of the manufacturer of cell phone batteries is that the median life of a battery is more than 40 hours. Suppose a random sample of 75 batteries finds that 32 have a life of more than 40 hours. Using α = .05, can we conclude that the battery life is more than 40 hours? A. Reject the null hypothesis, z = 1.38 B. Fail to reject the null hypothesis, z = 1.38 C. Reject the null hypothesis, z = -1.38 D. Fail to reject the null hypothesis, z = -1.38 Failed to reject H0, so we can't conclude that the battery life is more than 40 hours. Reject H0 if z > 1.645 AACSB: Analytic Skills Bloom's: Application Difficulty: Medium Learning Objective: 1 Topic: Sign Test 1-1851 Chapter 01 - An Introduction to Business Statistics 86. The claim of a local real estate agent is that the median selling price of homes in a major Midwestern city is more than \$200,000. Suppose a random sample of 100 homes sold in the last six months is taken and 53 sold for over \$200,000. State the null hypothesis to test the claim. Assume that the population of selling prices is not normally distributed. A. H0: Md ≤ 200000 B. H0: Md ≥ 200000 C. H0: Md ≠ 200000 D. H0: Md > 200000 H0: Md ≤ 200000 vs HA: Md > 200000 AACSB: Reflective Thinking Bloom's: Comprehension Difficulty: Medium Learning Objective: 1 Topic: Sign Test 87. The claim of a local real estate agent is that the median selling price of homes in a major Midwestern city is more than \$200,000. Suppose a random sample of 100 homes sold in the last six months is taken and 53 sold for over \$200,000. Using = .01, test the real estate agent's claim. What do you conclude about the selling prices of the homes? A. Reject the null hypothesis B. Fail to reject the null hypothesis Failed to reject H0 at α = .01 so we can't conclude that the median selling price is more than \$200,000. Reject H0 if z > 2.33 AACSB: Analytic Skills Bloom's: Application Difficulty: Medium Learning Objective: 1 Topic: Sign Test 1-1852 Chapter 01 - An Introduction to Business Statistics 88. Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. What is the appropriate null hypothesis for the claim that they distribute the same amount of coffee? A. H0: µDA ≥ µDB B. H0: µDA = µDB C. H0: µDA ≤ µDB D. H0: µDA ≠ µDB H0: DA and DB are identical probability distributions HA: DA is shifted to the right or left of DB Or H0: µDA = µDB HA: µDA ≠ µDB AACSB: Analytic Skills Bloom's: Application Difficulty: Hard Learning Objective: 2 Topic: Rank Sum 1-1853 Chapter 01 - An Introduction to Business Statistics 89. Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. Calculate the value of TA and TB A. 117,93 B. 131,79 C. 55,105 D. 105,55 TA = 117 TB = 93 AACSB: Analytic Skills Bloom's: Application Difficulty: Medium Learning Objective: 2 Topic: Rank Sum 1-1854 Chapter 01 - An Introduction to Business Statistics 90. Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. What is the test statistic T? A. 117 B. 93 C. 131 D. 79 T = 117 T = TA since nA = nB AACSB: Analytic Skills Bloom's: Application Difficulty: Medium Learning Objective: 2 Topic: Rank Sum 1-1855 Chapter 01 - An Introduction to Business Statistics 91. Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. On the average, can it be concluded that the machines distribute the same amount? Test at = .05 A. Reject the null hypothesis B. Fail to reject the null hypothesis Cannot reject the null hypothesis that the amounts are equal. T = 117 From the Wilcoxon Rank Sum Table for nA = 10 and nB = 10, TU = 131 and TL = 79 Reject H0 if T ≤ TL or T ≥ TU - neither conditi...
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