Back-to-Back Relative Frequency Histograms When using histograms to compare two data sets, it is sometimes difficult to make comparisons by looking back and forth between the two histograms. A backtoback relative frequency histogram has a format that makes the comparison much easier. Instead of frequencies, we should use relative frequencies (percentages or proportions) so that the comparisons are not difficult when there are different sample sizes. Use the relative frequency distributions of the ages of Oscar-winning actresses and actors from Exercise 15 in Section 22, and complete the backtoback relative frequency histograms shown below. Then use the result to compare the two data sets.

Solution 19BSC

The magnitudes appear approximately to be normal. The frequency start 5, and then increase to frequency 15, then increase to 19, then decrease to a frequency 7 and then decrease to two.