Scenario: Recall the World Development Indicators data in BirthRate 2005.

a. First, analyze the full table to determine the actual proportion of all countries that are in Sub-Saharan Africa. What is that proportion?

b. Now find and report the mean and standard deviation of the infant mortality rate for all countries.

c. Select a random sample of 30 countries. In your sample, what was the proportion of Sub-Saharan African countries? What was the mean infant mortality rate? How do your sample statistics compare to the values that you found in parts a and b? In your own words, explain the discrepancies.