The social networking site called Face book has grown quickly since its inception in 2004. In fact, Face book's United States user base grew from 42 million users to 103 million users between 2009 and 2010. The table below shows the age distribution of Face book users (in thousands) as it changed from January 2009 to January 2010.

a. Define the variable that has been measured in this table.
b. Is the variable quantitative or qualitative?
c. What do the numbers represent?
d. Construct a pie chart to describe the age distribution of Face book users as of January 4, 2009.
e. Construct a pie chart to describe the age distribution of Face book users as of January 4, 2010.
f. Refer to parts d and e. How would you describe the changes in the age distributions of Face book users during this 1-year period?

Age 13-17 18-24 25-34 35-54 55+ Unknown Total As of 1/04/2009 As of 1/04/2010 5675 17,192 11,255 6989 955 23 42,089 10,680 26,076 25,580 29,918 9764 1068 103,086