Question: A researcher is interested in whether a certain hour-long film that portrays the insidious effects of racial prejudice will affect attitudes toward a minority group. Two groups of 31 subjects each were randomly selected and randomly assigned to one of two conditions: Group A watched the movie, and Group B spent the hour playing cards. Both groups were then given a racial- attitude test, wherein high scores represented a higher level of prejudice. The data are as follows:

The estimated standard error of difference between the mean was 1.360.

a. Do you accept or reject the null hypothesis?

b. Is there a significant difference in the racial attitude scores between the two groups?

c. What type of research is this, post or experimental?

d. Identify both the IV and DV.