2.23 Gestational Period The Animals data set at the book’s website contains data on the length of the gestational period (in days) of 21 animals. (Source: Wildlife Conservation Society)

a. Using software, plot a histogram of the gestational period.

b. Do you see any observation that is unusual? Which animal is it?

c. Is the distribution right-skewed or left-skewed?

d. Try to override the default setting and plot a histogram with only very few (e.g., 3 or 4) intervals and one with many (e.g., 30) intervals. Would you prefer either one to the histogram created in part a? Why or why not?