# Question

The Thematic Apperception Test (TAT) presents participants with ambiguous pictures and asks them to tell a story about them. These stories can be scored in any number of ways. Werner, Stabenau, and Pollin (1970) asked mothers of 20 normal and 20 schizophrenic children to complete the TAT and then scored for the number of stories (out of 10) that exhibited a positive parent–child relationship. The data follow:

(a) What would you assume to be the experimental hypothesis behind this study?

(b) What would you conclude with respect to that hypothesis?

(a) What would you assume to be the experimental hypothesis behind this study?

(b) What would you conclude with respect to that hypothesis?

## Answer to relevant Questions

In Exercise 14.8 why might it be smart to look at the variances of the two groups? Let’s modify Exercise 15.12 to have sample means of 25 and 28, with a pooled standard deviation of 8 and sample sizes of 20 and 20. (a) What is the a priori power of this experiment? (b) Run the t test on the data. (c) ...If σ = 15, n = 25, and we are testing H0: µ = 100 versus H1: µ > 100, what value of the mean under H1 would result in power being equal to the probability of a Type II error? This is most easily solved by sketching the ...How many subjects would we need in Exercise 15.6 to have power 5 .80? Using the data in Exercise 16.2, calculate MSerror directly rather than by subtraction and show that this is the same answer you found in that exercise.Post your question

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