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Confidence Intervals for Population Proportion
8. Sampling Distributions & Confidence Intervals: Proportion / Confidence Intervals for Population Proportion / Problem 7
Problem 7

A survey of 15001500 smartphone users found that 42%42\% use a password manager to store their login information. The survey reports a margin of error of ±3%\pm3\%. Translate this information into a confidence interval and approximate the confidence level of the interval.