Wednesday

April 16, 2014

April 16, 2014

Posted by **alessandria** on Tuesday, November 15, 2011 at 7:11pm.

Use Excel and these data to compute a 90% confidence interval to estimate the average length of time an account manager spent working for the company before they were promoted to account manager. Print out your answer.

- statistics -
**MathGuru**, Wednesday, November 16, 2011 at 9:38amFormula for confidence interval:

CI90 = mean ± 1.645(sd/√n)

You will have to determine the mean and standard deviation. Sample size = 8

Using the formula by hand will double check your calculations.

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