Homework Help: statistics

Posted by Josh on Thursday, June 28, 2012 at 12:07am.

The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inch. Suppose a random sample of 20 balls is selected. Find the interval that contains 87% of the sample means.

statistics - PsyDAG, Thursday, June 28, 2012 at 10:44am
87% = mean ą 1.51 SEm

SEm = SD/√n
statistics - Josh, Thursday, June 28, 2012 at 5:48pm
What is square root n?
statistics - dave, Sunday, July 1, 2012 at 8:55pm
The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inch. Suppose a random sample of 20 balls is selected. Find the interval that contains 87% of the sample means

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