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Unformatted text preview: where n1 = 5, n2= 6, s12 = 15750, s22 = 10920 what critical value do we use? A. 2.821 B. 11.39 C. 8.75 D. 1.443 77. Find a 95 percent confidence interval for µ1- µ2, where n1= 50, n2 = 75, 76, σ12 = 8 and σ22 = 6. A. (5.04 6.96) B. (5.53 6.47) C. (5.19 6.81) D. (5.41 6.59) 78. Find a 95 percent confidence interval for µ1- µ2, where n1= 15, n2 = 10, = 1.04, s12 = .2025 and s22 = .0676. (Assume equal population variances) A. (0.587 1.213) B. (0.848 0.952) C. (0.629 1.171) D. (0.573 1.227) 79. Find a 98 percent confidence interval for the paired difference. . A. (-1.118 4.318) B. (-1.277 4.477) C. (1.075 2.125) D. (1.104 2.096) 1-836 1 = 82, 1 = 1.94, 2 = 2 Chapter 01 - An Introduction to Business Statistics 80. Find a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2 where A. (-0.0037 0.0237) B. (-0.0076 0.0276) C. (0.0004 0.0196) D. (0.0098 0.0102) 1 = .05, 2 = .04, n1= 500, n2 = 2000. 81. With a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2 where 1 = .05, 0276) can we reject the null hypothesis at α = .10? A. Yes, reject the null hypothesis B. No; we can't reject the null hypothesis 2 = .04, n1= 500, n2 = 2000 of (-.0076 . 82. Find a 95 percent confidence interval for the difference between the proportions of older and younger drivers who have tickets where A. (-.007 .057) B. (.024 .026) C. (-.002 .052) D. (-.014 .064) 1 = .275, 2 = .25, n1= 1000, n2 = 1000. 83. Find a 95 percent confidence interval for the difference between means where n1 = 50, n2= 36, 1 = 80, A. (4.16 5.84) B. (3.30 6.70) C. (4.40 5.60) D. (4.64 5.36) 2 = 75, σ12 = 5 and σ22 = 3. 1-837 Chapter 01 - An Introduction to Business Statistics 84. Find a 95 percent confidence interval for µ1- µ2, where n1= 9, n2 = 6, 59, s12 = 6 and s22 = 3. (Assume equal population variances) A. (2.357 7.643) B. (2.494 7.506) C. (2.528 7.472) D. (3.840 6.160) 1 = 64, 2 = 85. Find a 90 percent confidence interval for the difference between the proportions of Group l and Group 2. Let p1 represent the population proportion of the people in group 1 who are in favor of new packaging and Let p2 represent the population proportion of the people in group 2 who are in favor of new packaging, where 1 = .21, 2 = .13, n1= 300, n2 = 400. A. (.0472 .1128) B. (.0510 .1090) C. (.0232 .1368) D. (.0324 .1276) 86. When we test H0: µ1- µ2 ≤ 0, HA: µ1- µ2> 0, 1 = 15.4, = 35, n2 = 18 at α = .01, we can reject the null hypothesis. A. True B. False 87. When we test H0: µ1- µ2 ≤ 0, HA: µ1- µ2> 0, = 35, n2 = 18 at α = .01, the test statistic used is: A. 1.42 B. 2.10 C. 2.33 D. 21.6 1-838 1 = 15.4, 2 = 14.5, σ1 = 2, σ2 = 2.28, n1 2 = 14.5, σ1 = 2, σ2 = 2.28, n1 Chapter 01 - An Introduction to Business Statistics 88. At = .10, testing the hypothesis that the proportion of Consumer (CON) industry companies winter quarter profit growth is more than 2% greater than the proportion of Banking (BKG) companies winter quarter profit growth, given that 14, nCON = 300, nBKG = 400, we fail to reject the null hypothesis. A. True B. False CON = .20, BKG =. 89. At = .10, testing the hypothesis that the proportion of Consumer (CON) industry companies winter quarter profit growth is more than 2% greater than the proportion of Banking (BKG) companies winter quarter profit growth, given that CON= .20, nCON = 300, nBKG = 400, calculate the estimated standard deviation for the model. A. 0.0008 B. 0.0289 C. 0.0200 D. 0.0106 90. What is the F-statistic for testing H0: σ12 ≤ σ22, HA: σ22> σ12 at n2= 19, s12 = .03, s22 = .02? A. 1.50 B. 0.67 C. 1.22 D. 2.25 BKG = .14, = .05 where n1 = 16, 91. Testing H0: σ12 ≤ σ22, HA: σ12> σ22 at α = .05 where n1 = 16, n2= 19, s12 = .03, s22 = .02, we fail to reject the null hypothesis. A. True B. False 1-839 Chapter 01 - An Introduction to Business Statistics 92. Using the following data a test of the equality of variances for two populations at α = .10, where sample 1 is randomly selected from population 1 and sample 2 is randomly selected from population 2 finds that we reject H0 at α = .10. A. True B. False 93. Use the following data and a test of the equality of variances for two populations at α = . 10, where sample 1 is randomly selected from population 1 and sample 2 is randomly selected from population 2. Identify the critical value used for testing the equality of the variances. A. 1.138 B. 1.645 C. 5.05 D. 6.39 94. Testing the equality of means at = .05, 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), we determine that we can reject the null hypothesis. A. True B. False 95. Calculate the pooled variance 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. A. 2.539 B. 6.566 C. 6.856 D. 6.170 1-840 Chapter 01 - An Introduction to Business Sta...
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