9. What z-score values form the boundaries for the middle 65% of a normal distribution? A. Z=+1.28 and 2=-1.28 B. z= +0.25 and z= -0.25 C. z=-0,93 and 2=+0,93 D. Z= +0.84 and z=-0.84 10. A sample of n = 64 scores is selected from a population with u =75 with o=16, and the sample mean is M = 50. What is the standard error for the sample mean? A. 3 B. 2 C. 4 D. 8 11. If a sample of n= 16 scores is obtained from a population with u =80 and o =8, what is the z-score corresponding to a sample mean of M = 88? A. 3.5 B. 2 C. 4 D. 1.25 12. With a = .01, the two-tailed critical region for a t-test using a sample of n = 25 subjects would have boundaries of A. + 2.797 B. + 2.756 C. + 1.356 D. + 2.436 13. What is the level of measurement for the independent variable in an Independent samples t-test? A. Can be all three B. Ordinal C. Nominal D. Interval 14. What is the value of the population mean in an Independent samples t-test equation? A. The value of the sample mean B. 0 C. 1 D. The value of the population mean from the data 15. In a repeated measures (paired samples) t-test, how many times is (are) the group(s) measured? A. The two groups are measured twice B. The group is measured once C. The two groups are measured once D. The group is measured twice 16. The repeated measures t-test is structurally the same as the A. independent samples t-test B. Z-test C. Single-samplet-test D. Normal distribution Fit Page Width