Psychological Statistics Term Paper

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Z Test in Psychology

Stating the research question

The z test is being used to test whether watching a film about the conditions of institutionalized mentally ill patients will influence viewers' attitude towards the mentally ill. Evaluations are accomplished using a questionnaire and the scores for viewers and non-viewers will be compared using the z test.

The test subjects are students. The variable being tested by the z test is the mean scores obtained by the two groups on the survey instrument. The scores represent discrete numerical data. The z test will compare the survey score distributions between the two groups: viewers and non-viewers.

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Specifying the null and alternative hypotheses

The null hypothesis (H0) for this experiment is that the mean survey scores of the two groups, viewers and non-viewers, will not be significantly different using the probability cutoff value of 0.05 (alpha). The alternative hypothesis (HA) is that the mean survey scores are significantly different using alpha = 0.05.

HO: = 75

HA: 75.

Step 3: Calculating the test statistic

The mean (M) scores for viewers (V) and non-viewers (NV) is 70 and 75, respectively. The standard deviation (SD) for both samples is 12. Using the z test formula for comparing the means of two normally.....

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