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Hypothesis Testing using a Z-Test for Film

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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 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 (alpha), does showing the film change students' attitudes towards the chronically mentally ill?

a) What is your null hypothesis? Alternate hypothesis?
b) Is this a one-tailed or two-tailed hypothesis?
c) What is your obtained z? How is it obtained?
d) What is the criterion z? How is it obtained?
e) Do you reject or fail to reject the null hypothesis?
f) What is the conclusion drawn from the data?

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Solution Summary

The solution discusses hypothesis testing using a z-test for film about chronically mentally ill patients.

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a) What is your null hypothesis? Alternate hypothesis?

Null Hypothesis H0: mean = 75
Alternate Hypothesis Ha: mean is not equal to 75

b) Is this a one-tailed or ...

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Sandhya Sharma, MSc
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  • BSc, Meerut University
  • MSc, Meerut University
  • MPhil, Institute of Advanced Studies
  • MSc, AIT
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