Homework Help: Statistics

Posted by Zodra on Monday, August 23, 2010 at 6:18pm.

In a study to estimate a population mean, i start with a sample size 10 and calculate the 95% confidence interval. Suppose i am not satisfied with the size of the confidence interval and want to reduce it by half. Give an estimate of sample size that i need.

Statistics - MathGuru, Monday, August 23, 2010 at 7:19pm
To reduce the width of a confidence interval in half, you have to multiply the sample size by 4 (in effect quadrupling the sample size).

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