A difference in two numbers, like the means of two groups, is statistically significant when
A) it is smaller than usual.
B) it is particularly likely to occur.
C) it is unlikely to occur by chance.
D) its probability is near .50.

Question

Quizplus · Accepted Answer

Statistical significance is determined when a difference (such as between the means of two groups) is unlikely to occur by chance, indicating that the observed difference is likely due to a specific cause or effect rather than random variation.

A Difference in Two Numbers, Like the Means of Two