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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 fulm, and gives them a questionnaire about their attitudes. The main 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?

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1. What does it mean to set apha 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.

Grading criteria

explained what it means to set alpha at .02

correctly identified the null and alternatice hypotheses.

correctly identfified and explained whether theirs is a one – tailed or two – tailed hypothesis.

explained, whether one would reject or fail to reject the null hypothesis, and stte in words what the findings were.

wrote in a clear, concise, and orgainized manner, demonstrated ethical scholarship in accurate representation adn attribution of sources, displayed accurate spelling, grammer, and punctuation.


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