1. A random sample of n = 4 scores is obtained from a population with a mean of = 80 and a standard deviation of = 10. If the sample mean is M = 90, what is the z-score for the sample mean?

z = +2.00

z = +5.00

z = +20.00

z = +1.00

2. You are doing a study on sleep deprivation on logical thinking. You take a sample of n = 25individuals and deprive of them sleep so that they only get 4 hours of sleep for two nights. You then have them each solve a puzzle (this is how logical thinking is measured in this study), and find that the mean time to solve the puzzle is M = 30minutes. You know that for the population, the mean time to solve the puzzle is = 10minutes and the standard deviation is = 20. You want to answer the following research question:Does sleep deprivation have an effect on logical thinking?

You set alpha at = .05. This is a two-tailed test.

What is the CRITICAL REGION or Z-SCORE value for this study?

+1.96

+/- 1.96

+/- 1.65

-1.96

3. You are doing a study on sleep deprivation on logical thinking. You take a sample of n = 25 individuals and deprive of them sleep so that they only get 4 hours of sleep for two nights. You then have them each solve a puzzle, and find that the mean time to solve the puzzle isM = 30minutes. You know that for the population, the mean time to solve the puzzle is = 10minutes and the standard deviation is = 20. You want to answer the following research question:Does sleep deprivation have an effect on the amount of time it takes to solve this puzzle?

What is the value of the Z-STATISTIC for this sample mean?

+4.00

+5.00

+2.00

+1.00

4. You are doing a study on sleep deprivation on logical thinking. You take a sample of n = 25 individuals and deprive of them sleep so that they only get 4 hours of sleep for two nights. You then have them each solve a puzzle, and find that the mean time to solve the puzzle isM = 30minutes. You know that for the population, the mean time to solve the puzzle is = 10minutes and the standard deviation is = 20. You want to answer the following research question:Does sleep deprivation have an effect on the amount of time it takes to solve this puzzle?

Based on your answerto the previous question where you found the result of the z-statistic, what DECISION REGARDING THE NULL HYPOTHESIS should be made? Hint: Refer to the critical region that you found in question 21.

Reject the alternative hypothesis.

Fail to reject the null hypothesis.

Reject the null hypothesis.

Accept the null hypothesis.

5. You are doing a study on the effect of eating vegetables on self-reported energy levels. You take a sample of n = 36 individuals and instruct them to eat at least 6 servings of vegetables, prepared in any way they choose, for three weeks. After three weeks, you instruct them to complete a survey in which they report their energy level. The average self-reported energy level was M = 10. Suppose the mean for the population is = 20.5 and the standard deviation is = 42. You want to answer the following research question:Does eating vegetables have an effect on self-reported energy levels?

What does the null hypothesis say about the effect of eating vegetables on self-reported energy levels?

Eating vegetables has DOES have an effect effect on self-reported energy levels.

Eating vegetables will cause energy levels to decrease.

None of the other answers are correct.

Eating vegetables has NO effect on self-reported energy levels.

6. You are doing a study on the effect of eating vegetables on self-reported energy levels. You take a sample of n = 36 individuals and instruct them to eat at least 6 servings of vegetables, prepared in any way they choose, for three weeks. After three weeks, you instruct them to complete a survey in which they report their energy level. The average self-reported energy level was M = 10. Suppose the mean for the population is = 20.5 and the standard deviation is = 42. You want to answer the following research question:Does eating vegetables have an effect on self-reported energy levels?

This is a two-tailed test, and the alpha level for this test is = .05.

What is the critical region for this test?

+1.96

-1.96

+/- 1.65

+/- 1.96