What is Sampling ?

Calculating sample size

To calculate the sample size, you need the following parameters.

Z-score: The Z-score value can be found, here.

Standard deviation

Margin of error

Confidence level

To calculate use the sample size, use this formula:

Sample Size = (Z-score)2 * StdDev*(1-StdDev) / (margin of error)2

Consider the confidence level of 90%, standard deviation of .6 and margin of error, +/-4%

((1.64)2 x .6(.6)) / (.04)2

( 2.68x .0.36) / .0016

.9648 / .0016


603 respondents are needed and that becomes your sample size.

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