The "pre-1983 pennies" were made after the Indian and wheat pennies, and they are 97% copper and 3% zinc. The "post-1983 pennies" are 3% copper and 97% zinc. The "pre-1964 silver quarters" are 90% silver and 10% copper. The 'post-1964 quarters" are made with a copper-nickel alloy.
Indian.Pennies
Wheat.Pennies
Pre.1983.Pennies
Post.1983.Pennies
Canadian.Pennies
Pre.1964.Quarters
Post.1964.Quarters
Dollar.Coins
A data frame with 40 rows and 8 variables
Triola, M. 2014. Elementary Statistics, 12th ed. Boston, MA: Pearson.
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