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Suppose (as is roughly true) that 88% of college students were employed last summer. A samply survey interviews SRS of 400 college students at OSU. In the SRS, 324 college students were found to be employed last summer.

(a) What is the sample proportion ˆp of college students at OSU who worked last summer?

(b) What is the approximate distribution of the proportion ˆp of college students at OSU who worked last summer?

(c) Using the 68 - 95 - 99.7, if you had drawn an SRS of 400 college students in the US, between what two percents would you expect ˆp to fall about 95% of the time?

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