Chance (Spring 2000) reported on a study to estimate the number of pennies required to fill a coin collector’s album. The data used in the study were obtained by noting the mint date on each of a sample of 2,000 pennies. The distribution of mint dates is summarized in the following table:
Mint Date Number
Pre-1960 ........... 18
1960s ........... 125
1970s ........... 330
1980s ........... 727
1990s ........... 800
a. Identify the experimental unit for the study.
b. Identify the variable measured.
c. What proportion of pennies in the sample have mint dates in the 1960s?
d. Construct a pie chart to describe the distribution of mint dates for the 2,000 sampled pennies.