Sample Size and Target Population

The text book approach to determining a sample size is to estimate the expected effect size and then use statistical power analysis software to determine the necessary sample size for a given alpha level (e.g. 0.05) and power (e.g. 0.80) in order to detect the estimated effect size.

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Matching Pre-Post Data Annonymously

When utilizing a pre-test/post-test survey study design, it is necessary to match individual study participant’s pre-test data to their post-test data. Intuition might suggest the researcher only needs the study participants to write their name, email address, social security number or some other personal identifier on their pre/post surveys so they can later be matched.

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