Which of the following are true statements for back-to-back stemplot?
A. The distributions have the same mean.
B. The distributions have the same range.
C. The distributions have the same standard deviation.

II. The distributions have the same range.
III. The distributions have the same standard deviation.

A back-to-back stemplot is basically used for numerical data where two sets of data use the same set of stems. However, one data set displaces to the left while the other data set radiates to the right. Differences are easily made by comparing two groups and by displaying two sets of data in one stemplot.

The following back-to-back stemplot displays the scores on the final exam for a Statistics professor's Monday class (n = 29) and Wednesday class (n = 22), respectively. The scores are raw scores out of a possible 100 points.