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05 does the median time required to program a simple

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Unformatted text preview: esterol readings of patients after taking the drug. T- = 1.5 + 1.5 + 8 = 11 11 = 11, therefore we reject H0 and conclude that the drug appears to be effective in reducing cholesterol levels. AACSB: Analytic Skills Bloom's: Application Difficulty: Hard Learning Objective: 3 Topic: Signed Ranks test 1-1839 Chapter 01 - An Introduction to Business Statistics 74. Two NFL scouts are in the process of recruiting 7 college senior football players (receivers). After a careful review and evaluation, both scouts ranked the seven receivers in terms of their professional career prospects. If we want to determine whether the two scouts have similar opinions about the professional football career prospects of the seven players, state the null and alternative hypothesis. A. H0: ρs ≠ 0 B. H0: ρs ≥ 0 C. H0: ρs ≤ 0 D. H0: ρs = 0 H0: ρs = 0 and HA: ρs > 0 AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Medium Learning Objective: 5 Topic: Rank correlation coefficient 1-1840 Chapter 01 - An Introduction to Business Statistics 75. Two NFL scouts are in the process of recruiting 7 college senior football players (receivers). After a careful review and evaluation, both scouts ranked the seven receivers in terms of their professional career prospects. The rankings are given below. At = .05, does it appear that the two scouts have similar opinions about the professional football career prospects of the seven players? A. Reject the null hypothesis B. Fail to reject the null hypothesis Reject H0. Similar opinions. H0: ρs = 0 and HA: ρs > 0 r.05,7 = .714 .8571 > .714, therefore we reject H0. It appears that the two scouts have similar opinions about the professional football career prospects of the seven players. AACSB: Analytic Skills Bloom's: Application Difficulty: Hard Learning Objective: 5 Topic: Rank correlation coefficient 1-1841 Chapter 01 - An Introduction to Business Statistics 76. In a manufacturing facility producing fasteners, a foreman suspects that the diameter of the bolt produced by his first shift workers is greater than the diameter of the bolts produced by his second shift workers. He takes a sample of 5 bolts from the first shift and a sample of 4 bolts from the second shift and measures the diameters in inches. Below are the results from 5 first shift and 4 second shift observations. Distribution of bolt diameter measurements is not normally distributed. At = .05, can we conclude that his suspicion is correct? A. Reject the null hypothesis, diameter is greater for 1st shift versus 2nd shift B. Fail to reject the null hypothesis, no evidence that the diameters differ by shift Failed to reject H0. No, his suspicion is not correct. H0: D1 and D2 are identical probability distributions. or H0: µD1 ≤ µD2 HA: D1 is shifted to the right of D2 or HA: µD1 > µD2 Reject H0 if T ≤ TL TL= T.05,5,4 = 12 T1 = 5 + 8 + 3 + 7 + 6 = 29 T2 = 1 + 2 + 9 + 4 = 16 T = min (29,16) = 16 16 > 12, we failed to reject H0. It appears that the diameter of the bolt is not larger in the first shift. 1-1842 Chapter 01 - An Introduction to Business Statistics AACSB: Analytic Skills Bloom's: Application Difficulty: Medium Learning Objective: 2 Topic: Rank Sum 1-1843 Chapter 01 - An Introduction to Business Statistics 77. Three years ago, a major hotel chain purchased a large number of heating and airconditioning units from three major manufacturers, A, B and C. The accounting department of the hotel chain kept records on their repair and replacement costs over the last 3 years. The manager of the purchasing department randomly selected 6 brand A, 7 brand B, and 6 brand C heating and air-conditioning unit records. The repair and replacement costs in dollars are summarized in the following table. At = .05, can it be concluded that there is a significant difference in repair costs among the three brands? A. Reject the null hypothesis B. Fail to reject the null hypothesis Failed to reject H0. No significant difference. TA = 43.5TB = 95TC = 51.5 There is no significant difference in repair and replacement costs among the three brands of heating and air-conditioning units. 1-1844 Chapter 01 - An Introduction to Business Statistics AACSB: Analytic Skills Bloom's: Application Difficulty: Medium Learning Objective: 4 Topic: Kruskal-Wallis 78. In an effort to improve productivity in its factory, a firm recently instituted a training program for its workers. One of the work crews consisted of 14 workers. Seven workers from this crew were selected at random to attend the training course. All seven workers selected successfully completed the training course. The remaining seven workers served as a control group and did not attend the training course. Three months after the training course, a foreman who did not know which employees attended the training course was asked to rank all 14 employees in terms of their productivity. A rank of 14 indicates the most productive employee in the crew while a rank of one indicates the least produc...
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This document was uploaded on 01/20/2014.

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