Finding Sample Size With Standard Deviation. A normal population has a standard deviation of 15. Sigma σ or the approximated pop.
The equation is essentially the same excepting the N-1 term in the corrected sample deviation equation and the use of sample values. The table below gives sample sizes for a two-sided test of hypothesis that the mean is a given value with the shift to be detected a multiple of the standard deviation. The mean and standard deviation of the population 152 156 160 164 in the example are μ 158 and σ 20.
If not known the sample standard deviation can be used and the required margin of error E and the solver will find the minimum sample size required.
Begingroup If you knew the population proportion and the sample size could you compute the standard deviation. 2 P x μ x. This video will teach you how to find sample size Given Standard Deviation and Standard error of the mean. The MOE is the margin of error that is desired.
