When dealing with sample data,the existence of a given population main effect or interaction can be affirmed only by a:
A)visual inspection of sample means
B)visual inspection of slopes
C)significant statistical test

Question

Quizplus · Accepted Answer

A significant statistical test is the best choice for affirming the existence of a given population main effect or interaction because it takes into account the variability within the sample and provides a measure of the likelihood that the observed results could have occurred by chance alone. Visual inspection of sample means or slopes can provide some initial indication of the presence or absence of effects, but statistical tests are more reliable and conclusive.

When Dealing with Sample Data,the Existence of a Given Population