The following information is from the article College Students' Attitudes Toward UFOs, (College Student Journal, March 2009). In a random sample of 180 college students, 10 believed that aliens were responsible for building Stonehenge. Construct a 90% confidence interval for the true proportion of all college students who believe this. a) How many successes and failures are there in the sample? b) Are the new criteria for approximate normality satisfied? c) Compute the sample proportion, ?̂, of college students who believe that aliens are responsible for building Stonehenge.

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