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Unformatted text preview: What do you
conclude?
A. Reject the null hypothesis, pvalue = .0352
B. Fail to reject the null hypothesis, pvalue = .004
C. Reject the null hypothesis, pvalue = .004
D. Fail to reject the null hypothesis, pvalue = .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 11850 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 11851 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 11852 Chapter 01  An Introduction to Business Statistics 88. Two coffeevending 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 11853 Chapter 01  An Introduction to Business Statistics 89. Two coffeevending 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 11854 Chapter 01  An Introduction to Business Statistics 90. Two coffeevending 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 11855 Chapter 01  An Introduction to Business Statistics 91. Two coffeevending 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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This document was uploaded on 01/20/2014.
 Winter '14

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