8 A recent study has been published concerning the effects of carrots has on eyesight. Researchers have 100 participants take an eye exam. Two weeks later, they have the same 100 participants eat carrots, and take the same eye exam. What statistical test would you use to assess this data?

a. ANOVA

b.One sample z-test

c. One sample t-test

d. Independent samples t-test

e. Dependent samples t-test

10 If you ran a correlational study to assess if there is a relationship between exam stress and exam scores, what would be the hypotheses for this study?

a. H0: = 0; H1: 0

b. H0: < 0; H1: 0

c. H0: 0; H1: > 0

d. H0: 0; H1: < 0

e. H0: > 0; H1: 0

11 If you ran a correlational study to assess if there is a relationship between exam stress and exam scores, and you collected data from 92 students and found a pearson's r of .19, what would you conclude?

a. Fail to reject the null hypothesis, we find support for the theory that exam stress and exam scores have a relationship

b. Reject the null hypothesis, we find support for the theory that exam stress and exam scores have a relationship.

c. Fail to reject the null hypothesis, we do not find support for the theory that exam stress and exam scores have a relationship

d. Reject the null hypothesis, we do not find support for the theory that exam stress and exam scores have a relationship.

14 You recently completed an experiment concerning the effects of sugar on happiness. One group of 10 people are assigned a high sugar diet, another group of 10 people are assigned a moderate-high sugar diet, another group of 10 people are assigned a moderate-low sugar diet, and a final group of 10 people are assigned a low sugar diet. If I find that Ifail to rejectthe null hypothesis, what might my next step be?

a. Change my analysis and alpha to make the finding significant and then run post-hoc tests.

b. Run multiple dependent measures t-tests to see if there are any significant differences between particular groups

c. Run multiple independent samples t-tests to see if there are any significant differences between particular groups

d. Change my hypothesis to see if I can find something significant with a different hypothesis for this study

e. Run home and eat a tub of ice cream because there is nothing else that should be done statistically

15 If you calculated your a priori power to be .75, what is the best interpretation of this?

a. If the alternative distribution is true, we have a 75% chance of being able to reject the null with this experiment.

b. If the alternative distribution is false, we have a 75% chance of being able to reject the null with this experiment.

c. If the alternative distribution is true, we have a 25% chance of being able to reject the null with this experiment.

d. If the alternative distribution is true, we have a 25% chance of being able to reject the null with this experiment.

e. If the null distribution is true, we have a 75% chance of incorrectly rejecting the null hypothesis.

21 You want to run an experiment to assess if a new type of puppy therapy will decrease exam anxiety. You plan to sample 200 college students to compare test scores of students who are assigned to study versus students who are assigned to play with puppies before an exam. Before you conduct your experiment you run a power analysis and find that you have a statistical power value of 0.196.

a. What is your Type II error? Interpret.

b. What is your Type I error? Interpret.

c. Would you want to run this experiment? Why or why not?