Consider a sample proportion p

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The article "Thrillers" (Newsweek, April 22, 1985) stated, "Surveys tell us that more than half of America's college graduates are avid readers of mystery novels." Let p denote the actual proportion of college graduates who are avid readers of mystery novels. Consider a sample proportion p ⁄ that is based on a random sample of 225 college graduates.

a. If p = .5, what are the mean value and standard deviation of p ⁄ ? Answer this question for p = .6. Does p ⁄ have approximately a normal distribution in both cases? Explain.

b. Calculate P(p ⁄ > .6) for both p = .5 and p = .6.

c. Without doing any calculations, how do you think the probabilities in Part (b) would change if n were 400 rather than 225?

Reference no: EM131820576

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