Confidence interval of the true proportion
A current study of 900 internet users in Europe found that 20% of internet users were women. Determine the 99.5% confidence interval of the true proportion, p, of women in Europe who use the internet?
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The average cost of living for the family of 4 in twelve different cities was found to be $65,351 with a standard deviation of $7711. In dollars, what is a 90% confidence interval for the true mean, m?
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