Psychological Statistic – M2A2 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 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? What does it mean to set alpha at .05? What is your null hypothesis? Alternate hypothesis? Is this a one-tailed or two-tailed hypothesis? What is the critical z? Calculate the obtained z. Do you reject or fail to reject the null hypothesis? State in words what you have found.

References:

Feist, Jess, and Gregory Feist. Theories of Personality, 7th Edition. McGraw-Hill Learning Solutions, 2008. VitalBook file.  Retrieved from:  http://digitalbookshelf.argosy.edu/books/007-7376714/id/ch04 ; /ch06 ; and, /09

Franzoi, S. L. (2011).Psychology: A discovery experience. Australia: South-Western Cengage Learning.

Hurst, L. C. (1982). What was wrong with Anna O? Journal of the Royal Society of Medicine, 75(2), 129–131.

Weiten, W. (2012).Psychology: Themes and variations. Belmont, Calif: Cengage/Wadsworth.

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