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37. What test statistic should we use? A. z-statisticb. Right one-tailed testc. Left one-tailed testd. Two-tailed testAACSB: CABLOOM: 2Difficulty: MediumGoal: 2
A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is calculated. The results are presented below. The researcher is interested in determining whether there is evidence that the two processes yield different average errors. Assume that the population standard deviations are equal.38. What is the null hypothesis? AACSB: CABLOOM: 2Difficulty: MediumGoal: 1 39. What is the alternate hypothesis? a. .AACSB: CABLOOM: 2Difficulty: MediumGoal: 1
40. What is the degrees of freedom? a. 10b. 13c. 26AACSB: CABLOOM: 2Difficulty: MediumGoal: 1 41. What is the critical tvalue at the 1% level of significance? a. +2.779b. 2.492c. 1.711D. 2.797AACSB: ASBLOOM: 3Difficulty: MediumGoal: 1 42. What is the computed value of tAACSB: ASBLOOM: 3Difficulty: HardGoal: 1
43. What is the decision at the 1% level of significance? AACSB: REFBLOOM: 4Difficulty: HardGoal: 1 44. If the calculated value of tis +2.70, what would be the decision using the 0.01 level of significance? a. Reject the null hypothesis and conclude the means are different.b. Reject the AACSB: REFBLOOM: 4Difficulty: HardGoal: 1 45. This example is what type of test? a. One sample test of means.B. Two sample test of means.c. Paired t-test.d. Test of proportions.AACSB: CABLOOM: 2Difficulty: MediumGoal: 1
The results of a mathematics placement exam at two different campuses of Mercy College follow: 46. What is the null hypothesis if we want to test the hypothesis that the mean score on Campus 1 is higher than on Campus 2? a. .b. .c. .d. .AACSB: CABLOOM: 2Difficulty: MediumGoal: 1 47. What is the computed value of the test statistic? a. 9.3b. 2.6AACSB: ASBLOOM: 3Difficulty: HardGoal: 1