The CDC reported very large weight increases for U.S. residents of both genders and all age groups over the past four decades. Go to the Web site that reports these data (www.cdc.gov) and search for the article titled “Americans Slightly Taller, Much Heavier Than Four Decades Ago.” 

a. What were the average weights of 10-year-old girls in 1963 and in 2002? 

b. Do you think the CDC weighed every girl in the United States to get these averages? If not, explain why this would not be feasible. 

c. How does the average weight of 10-year-old girls in 2002 or the average weight of 10-year-old boys in 1963 represent both a descriptive and an inferential statistic?