SOLUTION: In a survey of 7000 women, 4431 say they change their polish once a week. Construct a 99% confidence interval for the population proportion of women who change their polish once a

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Question 801855: In a survey of 7000 women, 4431 say they change their polish once a week. Construct a 99% confidence interval for the population proportion of women who change their polish once a week.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
In a survey of 7000 women, 4431 say they change their polish once a week. Construct a 99% confidence interval for the population proportion of women who change their polish once a week.
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p-hat = 4431/7000 = 0.633
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E = 2.5758*sqrt[0.633*0.367/7000] = 0.0148
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99% CI: 0.633- 0.0148 < p < 0.633+ 0.0148
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99% CI: 0.6182 < p < 0.6478
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Cheers,
Stan H.
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