The hist() and truehist() functions

Histograms are probably the best-known way of looking at how the values of a numerical variable are distributed over their range, and R provides several different histogram implementations.

The purpose of this exercise is to introduce two of these:

hist() is part of base R and its default option yields a histogram based on the number of times a record falls into each of the bins on which the histogram is based.
truehist() is from the MASS package and scales these counts to give an estimate of the probability density.

Use the par() function to set the mfrow parameter for a side-by-side array of two plots.
Use the hist() function to generate a histogram of the Horsepower variable from the Cars93 data frame. Set its main argument equal to the title of the plot, "hist() plot".
Use the truehist() function to generate an alternative histogram of the same variable. Title this plot, "truehist() plot" by specifying its main argument accordingly.

Take Hint (-30 XP)