# Sample size

Not what you're looking for? Search our solutions OR ask your own Custom question.

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).

Â© BrainMass Inc. brainmass.com November 24, 2022, 11:57 am ad1c9bdddfhttps://brainmass.com/math/algebra/sample-size-example-questions-32173

#### Solution Summary

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

$2.49