Hypothesis testing (classic)

An administrator working in a child guidance center tests the hypothesis that family income will be related to number of treatment sessions attended. Her sample size is large, and her level of significance is .05. How should her critical region appear in her theoretical sampling distribution? A. It should be split between the right and left tails, with .025 appearing in each tail. B. It should appear in the tail signifying a negative relationship, with .05 in that tail. C. It should appear in the tail signifying a positive relationship, with .05 in that tail. D. It should be split between the right and left tails, with .05 appearing in each tail.

A. It should be split between the right and left tails, with .025 appearing in each tail.

Which of the following statements is true about one-tailed tests of significance? A. They increase the chances of reaching the critical region if the results are in the predicted direction B. The critical region is at both ends of the theoretical sampling distribution. C. They require greater between-group differences in order to reach the critical region. D. They are used mainly with very large samples.

A. They increase the chances of reaching the critical region if the results are in the predicted direction

A two-tailed test of significance splits the critical region at both ends of the theoretical sampling distribution. A. True B. False

A. True

The critical region is that area of the theoretical sampling distribution where our sample statistic needs to fall in order to be deemed statistically significant. A. True B. False

A. True

When testing a nondirectional hypothesis, we use a two-tailed test of significance. A. True B. False

A. True

The theoretical sampling distribution shows the likelihood of getting a particular finding just due to sampling error. A. true B. false

A. true

When we get findings that warrant rejecting the null hypothesis, we should: A. Conclude that there is no chance whatsoever that our findings could be due to sampling error. B. Remember that design issues might still be alternative explanations for our findings. C. Rule out design issues as alternative explanations for our findings. D. None of these.

B. Remember that design issues might still be alternative explanations for our findings.

When we are testing directional hypotheses, we should: A. Always use a two-tailed test. B. Use a two-tailed test if we want to be able to reject the null hypothesis in case our findings are in the opposite direction from the one predicted in our hypothesis. C. Never use a two-tailed test. D. None of these.

B. Use a two-tailed test if we want to be able to reject the null hypothesis in case our findings are in the opposite direction from the one predicted in our hypothesis.

The cutoff point that separates the critical region probability from the rest of the area of the theoretical sampling distribution can be called the: A. Level of significance. B. Rejection level. C. Alpha level. D. All of these.

D. All of these.

The probability that we are willing to risk being wrong in rejecting the null hypothesis is: A. Called the alpha level. B. Located in the smaller portion of the theoretical sampling distribution after the cutoff point. C. Called the level of significance. D. All of these.

D. All of these.