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7 Chapter 6 t-Tests: Testing Two Mean Dierences 6.1. A two-sample t-test would be appropriate for which of the following directional hypotheses? a.Hl: ftasM2 b'HI: will: *C.H]: uluz d.H|: M1>M2 6.2. Which of the following is not an assumption for the t- test? *a. Normally distributed variances in the populations b. Normally distributed score values in the populations c. Homogeneity of variances in the populations d. Random sampling of cases from the populations 6.3. Which of the following is true about ttests? a. They are used when both the independent and dependent variable are nominal-level variables. *b. They are used when the dependent variable is measured on an interval or ratio scale. c. They are robust to the violation of all assumptions as long as N is at least 30. (1. They require measurements from people at least two points in time. 6.4. If cholesterol levels in twins were being compared, one of whom in each pair was randomly assigned to a special dietary intervention, the appropriate statistical test would be the: a. Onesample t-test b. Independent groups t-test c. Between-subjects t-test *d. Dependent groups ttest 6.5. If smokers and nonsmokers were compared in terms of number of days absent from work annually, the appropriate statistical test would be the: a. One-sample t-test *b. Independent groups t-test C. Paired ttest d. Dependent groups t-tcst 6.6. In a longitudinal study of 200 nursing school graduates, nurses who did not participate in the 3-year follow-up were compared to those who did. The appropriate statistical test would be the to assess for bias. (Fill in the blanks.) a. Independent groups t-test, selection *b. Independent groups r-test, attrition c. Dependent groups ttest, cohort d. Dependent groups ttest, nonresponse "(1 7 Tn Hm meme in am