A general rule of thumb for the Large Enough Sample Condition is that n≥30, where n is your sample size. … You have a moderately skewed distribution, that’s unimodal without outliers; If your sample size is between 16 and 40, it’s “large enough.”

Is 70 a good sample size?

With a total sample size of 70, there is a less than 10% gain in precision when adding further participants to the study size. So in terms of good precision and minimal bias (for a continuous outcome) a total sample size of 70 seems desirable for a pilot study.

What is an average sample size?

Average sample size is an estimate of the expected sample size in sequential testing where one can perform optional stopping and maintain error guarantees.