Homework Help: statistics

Posted by vickie on Monday, July 30, 2012 at 9:35am.

In a time-use study, 20 randomly selected managers were found to spend a mean of 2.40 hours each day on paperwork. The standard deviation of the the 20 scores is 1.30. Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for the mean time spent on paperwork by all managers.

statistics - MathGuru, Monday, July 30, 2012 at 5:14pm
Formula:

CI95 = mean ą 1.96(sd/√n)

Your data:
mean = 2.40
sd = 1.30
n = 20

Plug the values into the formula and calculate the interval.

I hope this will help get you started.

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