# Sample size

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1) Solve formula for variable:

The formula for the margin of error to establish a confidence interval has been found mathematically to be:

e= z s / square root of n

Where: e = margin of error

z = critical value

s = sample standard deviation

n = sample size

Given known values for e, z, and s solve the margin of error formula n to determine sample size.

(See attachment for full question).

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##### Solution Summary

Given the formula for margin of error, derives the formula for sample size.

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