Foofy studies if hearing an argument in favor of an issue alters participantsâ€TM 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, _ μ= 50. She obtains X = 53.25
and s2 X = 569.86. (a) What are H0 and Ha? (b) What is tobt? (c) With α =.05, what is tcrit? (d) If appropriate, compute the confidence interval for μ (e) What conclusions should Foofy draw about the relationship?
14. 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?