Select the members who fit the criteria which in this case will be 1 in 10 individuals. For Finite Sample Size. The formula of the sample size for the mean is similar to that of the proportion except for the measure of variability.
Formulas for Sample Size SS For Infinite Sample Size.
Auditor generally Certified Public Accountant CPA use this formula at large for vouching and verification purposes in auditing the companys accounts. The formula for the sample size can be written mathematically as follows. Can be solved for n yielding n 4 W2 1 B2 where B is the error bound on the estimate ie the estimate is usually given as within B. 196 for 95 confidence level p percentage picking a choice expressed as decimal.