chap12-TIF-SMUME5e

chap12-TIF-SMUME5e - Chi-Square Tests and Nonparametric...

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Unformatted text preview: Chi-Square Tests and Nonparametric Tests 123 CHAPTER 12: CHI-SQUARE TESTS AND NONPARAMETRIC TESTS 1. When testing for independence in a contingency table with 3 rows and 4 columns, there are ________ degrees of freedom. a) 5 b) 6 c) 7 d) 12 ANSWER: b TYPE: MC DIFFICULTY: Easy KEYWORDS: Chi-square test of independence, degrees of freedom 2. If we use the 2 method of analysis to test for the differences among 4 proportions, the degrees of freedom are equal to: a) 3 b) 4 c) 5 d) 1 ANSWER: a TYPE: MC DIFFICULTY: Easy KEYWORDS: Chi-square test for difference in proportions, degrees of freedom 3. If we wish to determine whether there is evidence that the proportion of successes is the same in group 1 as in group 2, the appropriate test to use is a) the Z test. b) the 2 test. c) Both a) and b). d) Neither a) nor b). ANSWER: c TYPE: MC DIFFICULTY: Easy KEYWORDS: Chi-square test for difference in proportions 4. In testing a hypothesis using the 2 test, the theoretical frequencies are based on the a) null hypothesis. b) alternative hypothesis. c) normal distribution. d) None of the above. ANSWER: a TYPE: MC DIFFICULTY: Easy 124 Chi-Square Tests and Nonparametric Tests KEYWORDS: Chi-square test for difference in proportions, Chi-square test of independence, properties TABLE 12-1 A study published in the American Journal of Public Health was conducted to determine whether the use of seat belts in motor vehicles depends on ethnic status in San Diego County. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) ethnic status (Hispanic or non-Hispanic) and (2) seat belt usage (worn or not worn) during the accident. The number of children in each category is given in the table below. Hispanic Non-Hispanic Seat belts worn 31 148 Seat belts not worn 283 330 5. Referring to Table 12-1, which test would be used to properly analyze the data in this experiment? a) 2 test for independence b) 2 test for differences among more than two proportions c) Wilcoxon rank sum test for independent populations d) McNemar test for the difference between two proportions ANSWER: a TYPE: MC DIFFICULTY: Moderate KEYWORDS: Chi-square test of independence, 6. Referring to Table 12-1, the calculated test statistic is a)-0.9991 b)-0.1368 c) 48.1849 d) 72.8063 ANSWER: c TYPE: MC DIFFICULTY: Easy KEYWORDS: Chi-square test of independence, test statistic 7. Referring to Table 12-1, at 5% level of significance, the critical value of the test statistic is a) 3.8415 b) 5.9914 c) 9.4877 d) 13.2767 ANSWER: a TYPE: MC DIFFICULTY: Easy KEYWORDS: Chi-square test of independence, critical value 8. Referring to Table 12-1, at 5% level of significance, there is sufficient evidence to conclude that Chi-Square Tests and Nonparametric Tests 125 a) use of seat belts in motor vehicles is related to ethnic status in San Diego County....
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This note was uploaded on 10/15/2010 for the course BUS 30.2 taught by Professor Reich during the Fall '07 term at CUNY Brooklyn.

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chap12-TIF-SMUME5e - Chi-Square Tests and Nonparametric...

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