Argosy Phoenix AZ PSYCHOLOGY 210 Module 2 Assignment – Conducting a z-Test

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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 a similar
class of students who did not see the film is 75. The standard deviation is 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.
Suppose
the obtained z was -2.5. Do you reject or fail to reject the null hypothesis?
6.
State
in words what you have found.