Foofy studies if hearing an argument in favor of an issue alters participants’ attitudes toward the issue one way or the other. She presents a 30-second argument to 8 people. In a national survey about this issue, mu = 50. She obtains X- = 53.25 and sX2 = 569.86. (a) What are H0 and Ha? (b) What is tobt? (c) With alpha = .05, what is tcrit? (d) If appropriate, compute the confidence interval for mu. (e) What conclusions should Foofy draw about the relationship? In question 13, (a) What statistical principle should Foofy be concerned with? (b) Identify three problems with her study from a statistical perspective. (c) Why would correcting these problems improve her study?

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