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15 December, 18:01

Question 1. use the above survey results to construct a 95% confidence interval for the proportion p of all ohio state university female students who would be willing to walk somewhere after dark that they would normally not go if they had a cell phone.

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  1. 15 December, 19:21
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    Za/2 = invnorm (.975,0,1) = 1.96

    confidence interval:

    .42 + / - 1.96*square root of ((.42) (1-.42) / 305)

    .42 + / -.05539

    (.42 -.05539,.42 +.05539

    (.36461,.47539)

    Lower bound:.365 (rounded to 3 decimals)

    Upper bound:.475 (rounded to 3 decimals)
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