I would like to inform my opinion about point 8 “Lack of statistical significance indicates that theeffect size is small” (on page 341).
In my opinion, the objectives and setting of the study have a major impact from the proper sample size. In general, a good sample size is one that allows reliable statistical analysis as well as accurately represents the population.
I think larger sample sizes are preferable because they offer a more accurate representation of the population and smaller the possibility of sampling errors. But the larger sample sizes is also increase the effect of practical variables, such as availability of researcher, budget, and time.