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Statistics Questions

Statistics Questions - Question 1 A major airline is...

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Question 1 A major airline is concerned that its proportion of late arrivals has substantially increased in the past month. Historical data shows that on average 18% of the company airplanes have arrived late. In a random sample of 1,240 planes, 310 have arrived late. Which of the following conclusions is correct ? Answer a. This is a one tailed test of one proportion and Z = 6.4 b. This is a one tailed test of two proportions and t = 6.4 c. This is a two tailed test of two proportions and Z = 6.4 d. This is a two tailed test of two proportions and t = 6.4 e. This is a two tailed test of one proportion and t = 6.4 Question 2 Is there a difference in variances for the following samples: X-bar 1 = 34.36, X-bar 2 = 26.45, s1 = 9, s2 = 6, n1 = 10 and n2 = 16 . Answer a. no, F = 1.5 b. no, Z = 1.5 c. no, F = 2.25 d. no, t = 2.25 e. no, F = .44 Question 3 In an opinion survey, a random sample of 1000 adults from the US and 1000 adults from Germany were asked whether they supported the death penalty. 590 American adults and 560 German adults indicated that they did. The researcher wants to know if there is significant evidence to conclude that the proportion of adults supporting the death penalty in both countries is different. Is there a difference ? Answer
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a. No, t = 1.36, p-value = .18 b. Yes, Z = 1.36, p -value = .18 c. No, Z = 1.36, p-value = .18 d. Yes, F = 1.36, p-value = .18 e. Impossible to determine without knowing the standard deviations Question 4 Twenty students are each given two Texas Instrument calculators (TI BA II Plus and TI- 89) and asked to rate each calculator in terms of their functions and ease of use. The most appropriate test to determine if the calculators are different is : Answer a. Z - one sample test of proportions b. Z - two sample test of means c. t - two sample test of means d. t - two sample paired test e. F -test Question 5 Cakes-R-Us Bakery is having problems receiving timely delivery of flour and sugar from their supplier. Some weeks the material arrives early and other weeks it gets to them several days late. In an effort to minimize their inventory requirements, the bakery tries another supplier.
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