An effect that is large enough to occur less than 5 percent of the time if the null hypothesis were true is called a:
A) meaningful statistical effect.
B) statistically important effect.
C) statistically significant effect.
D) meta-analytic effect.

Question

Quizplus · Accepted Answer

A statistically significant effect is one that is unlikely to occur by chance and has a p-value less than 0.05 (or another predetermined level of significance). This means that the null hypothesis can be rejected and the alternative hypothesis can be supported with a certain level of confidence. Choices A and B are not commonly used terms in statistics, and D refers specifically to a type of quantitative research synthesis.

An Effect That Is Large Enough to Occur Less Than