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February 1, 2015

February 1, 2015

Posted by **Billy** on Monday, March 22, 2010 at 4:18pm.

True or False: Suppose the population mean is 50 and the population variance is 100 for a population. In a sample where n = 100 is randomly taken, 90% of all possible sample means will fall between 49 and 51.

- Statistics -
**MathGuru**, Monday, March 22, 2010 at 7:18pmLet's see:

CI90 = mean + or - 1.645 (sd/√n)

With the data given:

CI90 = 50 + or - 1.645 (10/√100)

Note: standard deviation is the square root of the variance.

Do the calculation for the confidence interval and see if your answer is correct.

I hope this will help.

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