If two bell-shaped curves have large overlap and their average scores are close, this means what is small

Question

Quizplus · Accepted Answer

Large overlap between two bell-shaped curves means that the spread of the data is small, which implies a small standard deviation. It does not necessarily imply a particular correlation coefficient, and a t-test would be used to test for a difference in means between two groups rather than to describe the overlap.

If Two Bell-Shaped Curves Have Large Overlap and Their Average