8. For a two-tailed test with -0.05, the tert value is a. either +1.96 or -1.96.

Question

8. For a two-tailed test with -0.05, the tert value is a. either +1.96 or -1.96. b. both +1.96 and -1.96. c. either +1.645 or-1.645 d. different for each df 9. Interval estimation suggests a to where we expect the fall a. range of values; population parameter b. specific value; population parameter c. range of values; sample mean d. specific value; sample mean 10. To achieve statistical significance for a one-sample -test, upper tail a. the t-obtained must equal the t-critical b. the t-obtained must be less than the t-critical. c. the t-obtained must be larger than the t-critical. d. the t-obtained must differ from the t-critical by .05. 11. The first 10 students who arrived for the Friday lecture filled out a questionnaire on their attitudes toward the instructor. The first 10 who were late for the lecture were spotted, and afterward filled out the same questionnaire. The appropriate design for testing the significance of the difference between the means is a. related-samples t-test. b. independent-samples t-test. c. one-sample t-test. d. z-test.

Explanation / Answer

8. Critical value of t-test depends on the degrees of freedom

of the test. Hence, Option (d) is the correct choice. (Ans).

9. Interval estimation suggests a range of values where we

expent the population parameter to fall. Hence, Option (a) is

the correct choice. (Ans).

10. We achieve statistical significance for an one-sample

t-test (upper-tail), if t-obtained is larger than t-critical. Hence,

Option (c) is the correct choice.(Ans).

11. Since, the samples are independent, we should apply

independent sample t-test. Hence, Option (b) is the correct

choice. (Ans).

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