The t value that you obtain in Exercise 14.1 will be somewhat smaller than the t value from Exercise 13.1. Why should we have anticipated this?
Answer to relevant QuestionsGiven 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. Why can’t we use random assignment in the study of homophobia, and what effect will that have on the conclusions we are allowed to draw? 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) ...Calculate the power of the anorexia experiment in Section 14.1, assuming that the parameters have been estimated correctly. An important study in the memory literature is an old study by Eysenck (1974) in which he compared the recall of older participants under one of five levels of processing of the material. He demonstrated that when asked to ...
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