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    T intervals and z intervals and p-hat

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    In an ABCNews.com nationwide poll done in 2001, the proportion of respondents who thought that it should be illegal to use a hand held cell phone while driving a car was 69 %. The poll's sample was 1027.

    A) Find the value of the standard error of the sample proportion.

    B) Find a 90% confidence interval estimate of the population proportion that thinks it should be illegal to use a cell phone while driving.

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    Solution Summary

    This solution provides answers to two questions regarding ABCNews.com and their nationwide poll done in 2001.