Assignment 2: Conducting az-test, psychology homework help

Assignment 2: Conducting a z-Test

A researcher predicts that watching a film on
institutionalization will change students’ attitudes about chronically
mentally ill patients. The researcher randomly selects a class of 36
students, shows them the film, and gives them a questionnaire about
their attitudes. The mean score on the questionnaire for these 36
students is 70. The score for people in general on this questionnaire is
75, with a standard deviation of 12. Using the five steps of hypothesis
testing and the 5% significance level (i.e. alpha = .05), does showing
the film change students’ attitudes towards the chronically mentally
ill?

1. What does it mean to set alpha at .05?
2. What is your null hypothesis? Alternate hypothesis?
3. Is this a one-tailed or two-tailed hypothesis?
4. What is the critical z?
5. Calculate the obtained z. Do you reject or fail to reject the null hypothesis?
6. State in words what you have found.