A researcher predicts that showing a certain film will change people’s attitudes toward alcohol. The researchers then randomly select 36 people, show them the film, and give them an attitude questionnaire. The mean score on the attitude questionnaire for this sample of people is 70. In the general population, the average score for people on this test is 75, with a standard deviation of 12 (assume the alpha level = .05). a. Identify the independent variable. b. Identify the dependent variable. c. In a sentence, state the null hypothesis.
A researcher predicts that showing a certain film will change people’s
attitudes toward alcohol. The researchers then randomly select 36 people, show them the film, and give them an attitude questionnaire. The mean score on the attitude questionnaire for this sample of people is 70. In the general population, the average score for people on this test is 75, with a standard deviation of 12 (assume the alpha level = .05).
a. Identify the independent variable.
b. Identify the dependent variable.
c. In a sentence, state the null hypothesis.
d. Using symbols, state the null hypothesis.
e. Using symbols, state the alternative hypothesis.
f. Conduct the hypothesis test using a two-tailed test with alpha = .05.
g. What is your conclusion regarding the null hypothesis? Should you reject or fail to reject the null hypothesis?
h. What can you conclude about the film and attitudes toward alcohol based on your hypothesis test results?
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