The mean scores of two groups participating in a study are exactly the same for a particular variable. This suggests that the:
A) average score is the same, but distribution of scores for each group are not known.
B) distribution and range of scores will be similar.
C) groups are definitely heterogeneous in relation to this variable.
D) groups are very much alike in relation to the variable.

Question

Quizplus · Accepted Answer

The mean is a measure of central tendency and indicates the average score of a group, but does not indicate the variability of the scores around the mean. A measure of dispersion is required to demonstrate the distribution of scores.
Because the mean is the same on one variable does not mean that the two groups are the same in other ways.
If groups are definitely heterogeneous in relation to this variable, this would mean that the groups are very different.
The exact same mean does not equate to sameness in other ways.

The Mean Scores of Two Groups Participating in a Study