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Calculations for Standard Error of the Mean

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The standard error of the mean for a sample of 100 is 30. In order to manipulate the standard error of the mean to be 15, we would:

A. increase the sample size to 200
B. increase the sample size to 400
C. decrease the sample size to 50
D. decrease the sample size to 25.

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This solution involves calculations for standard error of the mean.

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The standard error of the mean for a sample of 100 is 30. In order to manipulate the standard error of the mean to be 15, ...

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