6. Now you will study the growth of the populations in the 187 countries. Obtain a new variable, GROWTH = BIRTH - DEATH, which is the difference between birth rate and death rate for each country. Note that the new variable roughly measures the annual population growth per 1,000 of population (assuming negligible migration). (a) Obtain side-by-side boxplots of GROWTH by CONTINENT. Check the "Use fences to identify outliers" option. Paste the output into your report. (b) Compare the centers, spreads, and shapes of the six distributions. In particular, which continent has the highest population growth? Which one has the smallest population growth? If there are any outliers, identify them for each group. (c) Obtain the mean, median, standard deviation, variance, and IQR of the differences, grouping by continent. Paste the output into your report. Compare the numerical summaries for the six continents. Comment briefly