Now that you understand the reasoning behind making inferences about populations based on samples (confidence intervals and hypothesis tests), explain why these methods require the use of random, or at least representative, samples instead of convenience samples.
Answer to relevant QuestionsWould it be easier to reject hypotheses about populations that had a lot of natural variability in the measurements or a little variability in the measurements? Explain. Refer to the quote in Exercise 25. Explain what is meant by the second sentence of the quote. In reporting the results of a study to compare two population means, explain why researchers should report each of the following: a. A confidence interval for the difference in the means. b. A p-value for the results of the ...A meta-analysis of 32 studies on the effectiveness of “self-talk” on sports performance was summarized as follows: The analysis revealed a positive moderate effect size (ES = .48). The moderator analyses showed that ...In Example 26.2, Janet’s handling of the fact that her data showed 26 volunteers in the control group when there should have been only 25.
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