Based upon extensive data from a national high school educational testing program, the standard deviation of national test scores for mathematics was found to be 121 points. If a sample of 256 students are given the test, what would be the standard error of the mean?

Step-by-step explanation:

The standard error of the mean is defined as the ratio of standard deviation to the square root of the sample size of a data. The standard error of the mean is mathematically expressed as shown below;

X is the standard error of the mean

is the standard deviation

n is the sample size.

Given;

On substitution into the formula we have;

X ≈ 7.56

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step-by-step explanation:

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step-by-step explanation:

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