Question

1. An unstandardized test of aggression has a mean of 35.19. You take a sample of 44 video game players and find their scores on this test have a mean of 39.84 and a standard deviation of 12.42. Are their aggression scores greater than the standard of 35.19?

a. State the null and alternative hypotheses.

b. Find your critical value(s) with a criterion of .01. Remember if the appropriate line is not available exactly in the table to pick the closest one. Draw the appropriate picture.

c. Compute the test statistic (Show all your work).

d. Compare it to the appropriate critical value and make your conclusion.

e. Compute the effect size

f. Write up a results section for your finding, following the example format from class

2. Consider the following data set which gives the multiple choice test scores of students who did not study on an unstandardized test of knowledge of the Napoleonic era. Are their test scores different than 25.00? 20 40 30 15 25 30 35 10 20 30 25

a. State the null and alternative hypotheses.

b. Find your critical value(s) with a criterion of .05. Draw the appropriate picture.

c. Compute the test statistic (Show all your work).

d. Compare it to the appropriate critical value and make your conclusion.

e. Compute the effect size

f. Write up a results section for your finding, following the example format from class

3. Your criterion for your hypothesis testing is .09.

a) The two tailed probability of your calculated z test is .10. (hint: Think about where this would place your calculated z relative to the region of rejection)

I Are your results statistically significant?

II Would you reject or fail to reject the null hypothesis?

III What type of error might you be making? Explain.

b) The two tailed probability of your calculated z test is .02

I Are your results statistically significant?

II Would you reject or fail to reject the null hypothesis?

III What type of error might you be making? Explain.

Answer 1