The document discusses sample size and recommends selecting the "sample sizes equal to or greater than 30" option if the sample size of both groups in a problem is equal to or greater than 30, otherwise selecting the "sample sizes less than 30" option. It notes that this recommendation provides the foundation for all inferential statistics and directs the reader to additional resources for a more thorough explanation of why sample size is important.

1. Sample Size
If in your problem the sample size of both groups is
equal to or greater than 30 then select the sample sizes
equal to or greater than 30 option otherwise select the
sample sizes less than 30.
Why is this?
The answer provides the foundation for all inferential
statistics.
See the Tutorial or listen to the Instructor Lecture for
an in-depth explanation.