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