# Question

You would probably be nervous about inferring a population estimate and a confidence interval for the mean U.S. SAT Combined score from the data in Table 11.1, but you are probably much less worried about your confidence limits on Pupil/Teacher ratio in Exercise 12.8. Why would this be?

## Answer to relevant Questions

Hout, Duncan, and Sobel (1987) reported on the relative sexual satisfaction of married couples. They asked each member of 91 married couples to rate the degree to which they agreed with “Sex is fun for me and my partner” ...Modify the data in Exercise 13.6 by shifting the entries in the “12 hour” column so as to increase the relationship between the two variables. Run a t test on the modified data and notice the effect on t. (You could ...Use techniques developed in Chapter 12 and this chapter to construct 95% confidence limits on the true mean difference between the Sexual Satisfaction scores in Exercise 13.1. Much has been made of the concept of experimenter bias, which refers to the fact that for even the most conscientious experimenters there seems to be a tendency for the data to come out in the desired direction. Suppose we ...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.Post your question

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