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Statistics - Confindence Interval

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What percentage of times will the mean (population proportion) not be found within the confidence interval?

What is the most controllable method of increasing the precision (narrowing) of the confidence interval?

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Solution Summary

A neat and step-by-solution is provided to determine the percentage of population proportion within the confidence interval as well as the most controllable method of increasing the precision (narrowing) of the confidence interval.

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(a) Let the population mean = mu and the population standard deviation = sigma

Assume that the confidence interval extends to Z standard deviations on both sides of the mean. Then we ...

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