Whenever the mean of the distribution of differences equals zero, then one can be fairly safe in concluding that
A) the samples probably represent a single population
B) the samples probably represent different populations
C) there was absolutely no sampling error
D) none of these, since the mean can never equal zero

Question

Quizplus · Accepted Answer

If the mean of the distribution of differences equals zero, it means that the two samples are not significantly different from each other. Therefore, it is likely that they represent a single population.

Whenever the Mean of the Distribution of Differences Equals Zero