# Question: Given the definition of a weighted average see page 350

Given the definition of a weighted average (see page 350), show what the pooled variance

estimate (s2p) would be if the two sample sizes were equal.

estimate (s2p) would be if the two sample sizes were equal.

## Relevant Questions

Demonstrate that, because we have equal sample sizes, I would have arrived at the same answer in Section 14.10 if I had not pooled the variances, although the degrees of freedom would probably differ. 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 ...Diagram the answer to Exercise 15.13. (a) What is the a priori power of this experiment? (b) Run the t test on the data. (c) What, if anything, does the answer to (a) have to say about the answer to (b)? Use G*Power or Piface to calculate the power of the comparison of Thematic Apperception T scores from the parents of schizophrenic and normal subjects in Exercise 14.8. Use protected t tests for the data in Exercise 16.7 to clarify the meaning of the significant F. In Exercise 16.7Post your question