1. If a difference between random samples is not statistically significant, it is probably __________. On the other hand, a statistically significant difference is not necessarily ___________.

a. important due to random chance

b. unimportant large

c. important unimportant

d. unimportant important

2. To maximize the probability of rejecting the null hypothesis, use a. low alphas and two-tailed tests

b. low alphas and high Z scores

c. high alphas but low degrees of freedom

d. high alphas, large samples, and one- tailed tests

3. The larger the sample size, the

a. more important the observed difference

b. more likely we are to reject the null hypothesis

c. less likely we are to reject the null hypothesis

d. lower the Z score

4. From a University population, random samples of 145 men and 237 women have been asked if they have ever cheated in a college class. 8% of the men and 6% of the women said that they have. What is the appropriate test to assess the significance of this difference? a. test for the significance of the difference between two sample proportions, large samples

b. test for the significance of the difference between two sample proportions, small samples

c. test for the significance of the difference between two sample proportions, matched samples

d. test for the significance of the difference between two sample means, large samples

5. When solving the formula for finding Z(obtained) with sample proportions in the two-sample case, we must first estimate

a. the standard deviation of the population

b. the population proportion

c. the ratio of the sample proportions

d. the critical region

6. From a University population, random samples of 45 seniors and 37 freshman have been given a scale that measures sexual experiences. The freshman report an average of 1.6 sexual partners over their lifetimes while seniors report an average of 2.5 partners. The t (obtained) for this difference was -3.56 while the t (critical) was 2.34.What can be concluded?

a. there is no significant difference between the classes

b. seniors and freshman are significantly different in their sexual experiences

c. freshman are more sexually active

d. relationship-related values are deteriorating

7. Samples from two high schools are being tested for the difference in their average levels of prejudice. One sample contains 39 respondents and the other sample contains 47 respondents. The appropriate sampling distribution is the

a. t distribution

b. Z distribution

c. F distribution

d. any of the above

8. Random samples of men and women have been given a scale that measures their support for gun control. Men average 10.2 with standard deviation of 5.3. Women also average 10.2 but their standard deviation is 1.8. How could these results be dealt with appropriately?

a. test the difference in the sample means for statistical significance

b. since the sample means are the same value, there is no need to conduct any tests; these results

cannot be significant

c. a one-tailed test of significance is called for

d. a test of significance with a very high alpha level (a > 0.10) is called for