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    Confidence interval: Use of Blackberries by students at OSU

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    Suppose you have drawn a simple random sample of 225 students from OSU.
    In this sample, 45 students own Blackberries. Let π denote the proportion of OSU students who own Blackberries. Construct a 95% confidence interval for π.

    Suppose you have drawn a simple random sample of 100 students from OSU
    and recorded how much money each student spent on room and board in Fall 2009. For your sample, sample mean (X) is $3500, and sample standard deviation (s) is $1500. Let μ denote the mean of this population. Construct a 95% confidence interval for μ

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    Solution Preview

    Problem: Suppose you have drawn a simple random sample of 225 students from OSU
    In this sample, 45 students own Blackberries. Let π denote the proportion of OSU students who own Blackberries. Construct a 95% confidence interval for π.

    Data: n p %
    225 0.2 95

    Standard Error, SE = Ö{p(1 - p)/n} = ...

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