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Statistics: Statistical Hypothesis Testing and Easy Keywords

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CHAPTER 10: TWO-SAMPLE TESTS WITH NUMERICAL DATA 1. The t test for the difference between the means of 2 independent populations assumes that the respective a) sample sizes are equal. b) sample variances are equal. c) populations are approximately normal. d) all of the above ANSWER: c TYPE: MC DIFFICULTY: Moderate KEYWORDS: pooled-variance t test, assumption 2. The t test for the mean difference between 2 related populations assumes that the respective a) population sizes are equal. b) sample variances are equal. c) populations are approximately normal or sample sizes are large enough. d) all of the above ANSWER: c …show more content…

b) 7 and 9. c) 18. d) 16. ANSWER: b TYPE: MC DIFFICULTY: Easy KEYWORDS: F test for equality of variances, degrees of freedom 13. The statistical distribution used for testing the difference between two population variances is the ___ distribution. a) t b) standardized normal c) binomial d) F ANSWER: d TYPE: MC DIFFICULTY: Easy KEYWORDS: F test for equality of variances, degrees of freedom 14. The test for the equality of two population variances is based on a) the difference between the 2 sample variances. b) the ratio of the 2 sample variances. c) the difference between the 2 population variances. d) the difference between the sample variances divided by the difference between the sample means. ANSWER: b TYPE: MC DIFFICULTY: Easy KEYWORDS: F test for equality of variances 15. To use the Wilcoxon rank sum test as a test for location, we must assume that a) the obtained data are either ranks or numerical measurements both within and between the 2 samples. b) both samples are randomly and independently drawn from their respective populations. c) both underlying populations from which the samples were drawn are equivalent in shape and dispersion. d) all of the above ANSWER: d TYPE: MC DIFFICULTY:

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