1-20chapter stats

21 2 13 n1 300 n2 400 a 0472 1128 b 0510 1090 c

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Unformatted text preview: tistics 96. Determine the 95% confidence interval for the difference between two population means where sample 1 has data: 16, 14, 19, 18, 19, 20, 15, 18, 17, 18, and sample 2 has data: 13, 19, 14, 17, 21, 14, 15, 10, 13, 15. (Assume equal population variances) A. (-0.16 4.76) B. (-0.58 5.18) C. (0.01 4.59) D. (0.56 4.04) 97. Calculate the t statistic for testing equality of means where 5.4, s22 = 5.2, n1= 6, n2 = 7. (Assume equal population variances) A. -2.42 B. -1.05 C. -2.63 D. -4.86 1 = 8.2, 2 = 11.3, s12 = 98. Find a 99 percent confidence interval for the difference between means n1 = 49, n2 = 49, 2 2 = 87, 2 = 92, σ1 = 13 and σ2 = 15. A. (-12.30 2.30) B. (-6.47 -3.53) C. (-6.94 -3.05) D. (-5.57 -4.43) 1 99. Let p1 represent the population proportion of U.S. Senate and Congress (House of Representatives) democrats who are in favor of a new modest tax on "junk food". Let p2 represent the population proportion of U.S. Senate and Congress (House of Representative) republicans who are in favor of a new modest tax on "junk food". Out of the 265 democratic senators and congressman 106 of them are in favor of a "junk food" tax. Out of the 285 republican senators and congressman only 57 of them are in favor of a "junk food" tax. Find a 95 percent confidence interval for the difference between proportions l and 2. A. (0.197 0.203) B. (0.163 0.238) C. (0.108 0.292) D. (0.125 0.275) 1-841 Chapter 01 - An Introduction to Business Statistics 100. Let p1 represent the population proportion of U.S. Senate and Congress (House of Representatives) democrats who are in favor of a new modest tax on "junk food". Let p2 represent the population proportion of U.S. Senate and Congress (House of Representative) republicans who are in favor of a new modest tax on "junk food". Out of the 265 democratic senators and congressman 106 of them are in favor of a "junk food" tax. Out of the 285 republican senators and congressman only 57 of them are in favor of a "junk food" tax. At = .01, can we conclude that the proportion of democrats who favor "junk food" tax is more than 5% higher than proportion of republicans who favor the new tax? A. Yes B. No 101. A fast food company uses two management-training methods. Method 1 is a traditional method of training and Method 2 is a new and innovative method. The company has just hired 31 new management trainees. 15 of the trainees are randomly selected and assigned to the first method, and the remaining 16 trainees are assigned to the second training method. After three months of training, the management trainees took a standardized test. The test was designed to evaluate their performance and learning from training. The sample mean score and sample standard deviation of the two methods are given below. The management wants to determine if the company should implement the new training method. Write the null hypothesis. A. B. C. D. 1-842 Chapter 01 - An Introduction to Business Statistics 102. A fast food company uses two management-training methods. Method 1 is a traditional method of training and Method 2 is a new and innovative method. The company has just hired 31 new management trainees. 15 of the trainees are randomly selected and assigned to the first method, and the remaining 16 trainees are assigned to the second training method. After three months of training, the management trainees took a standardized test. The test was designed to evaluate their performance and learning from training. The sample mean score and sample standard deviation of the two methods are given below. The management wants to determine if the company should implement the new training method. Write the alternative hypothesis. A. B. C. D. 103. A fast food company uses two management-training methods. Method 1 is a traditional method of training and Method 2 is a new and innovative method. The company has just hired 31 new management trainees. 15 of the trainees are randomly selected and assigned to the first method, and the remaining 16 trainees are assigned to the second training method. After three months of training, the management trainees took a standardized test. The test was designed to evaluate their performance and learning from training. The sample mean score and sample standard deviation of the two methods are given below. The management wants to determine if the company should implement the new training method. What is the absolute value of the rejection point (critical value of the test statistic) at α = .05? A. 2.045 B. 1.645 C. 1.699 D. 1.696 1-843 Chapter 01 - An Introduction to Business Statistics 104. A fast food company uses two management-training methods. Method 1 is a traditional method of training and Method 2 is a new and innovative method. The company has just hired 31 new management trainees. 15 of the trainees are randomly selected and assigned to the first method, and the remaining 16 trainees are a...
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