7. A random sample of n = 36 scores is selected from a population. Which of the following statements are true?

a. The scores in the sample will form a normal distribution

b. The scores in the population will form a normal distribution

c. The distribution of sample means will form a normal distribution

d. Neither the sample, the population, nor the sampling distribution will definitely be normal.

8. As sample size increases, the standard error of x________________

a. also increases

b. decreases

c. stays constant

d. cannot be determined using the available information

9. Which of the following would produce a standard error of 4 points?

a. n = 4 and = 16

b. n = 4 and = 64

c. n = 5 and = 20

d. n = 25 and = 20

10. The numerator of the z-score test statistic measures _____________.

a. the average distance between xand that would be expected if H0 was true.

b. the actual distance between xand .

c. the position of the sample mean relative to the critical region.

d. whether or not there is a significant difference between xand .

11. The denominator of the z-score test statistic measures _____________.

a. the "average" distance between xand that would be expected if H0 was true

b. the actual distance between xand

c. the position of the sample mean relative to the critical region

d. whether or not there is a significant difference between xand

12. Even if a treatment has no effect, it is still possible to obtain an extreme sample mean that is very different from the population mean. If this happens, you are likely to _____________.

a. reject H0 and make a Type I error

b. correctly reject H0

c. fail to reject H0 and make a Type II error

d. correctly fail to reject H0

13. A researcher administers a treatment to a sample of n = 25 participants. The hypothesis test produces a z-score of -2.37. Assuming that the researcher is using a two-tailed test, what decision should be made?

a. The researcher should reject H0 with either = .05 or = .01

b. The researcher should reject H0 with = .05 but not = .01

c. The researcher should fail to reject H0with either = .05 or = .01

d. need additional information to answer