The only time a difference between two sample means may be called "significant" is when
A) they are at least 10 points apart
B) they differ by at least .05 points
C) the first mean is larger than the second mean
D) the null hypothesis has been rejected

Question

Quizplus · Accepted Answer

The concept of statistical significance is directly tied to hypothesis testing. The null hypothesis assumes that there is no difference between the two means. If the null hypothesis is rejected, then it is concluded that there is a significant difference between the two sample means. Therefore, the correct answer is D - the null hypothesis must be rejected for there to be a significant difference between two sample means.

The Only Time a Difference Between Two Sample Means May