Posted by **Marnetta** on Tuesday, December 7, 2010 at 10:01am.

A researcher wants to estimate the mean serum cholesterol level for college age women. In a past study the stndard devition for this measure was 42 units. If the researcher wants to be off in his estimate by no more than three units ( with 99% confidence), how large must his sample be.?

- Statistics -
**MathGuru**, Wednesday, December 8, 2010 at 10:23pm
Formula:

n = [(z-value * sd)/E]^2

...where n = sample size, z-value will be 2.575 using a z-table to represent the 99% confidence interval, sd = 42, E = 3, ^2 means squared, and * means to multiply.

Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.

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