#' Data Set 21: Coin Weights (grams)
#'
#' 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.
#' \itemize{
#' \item Indian.Pennies
#' \item Wheat.Pennies
#' \item Pre.1983.Pennies
#' \item Post.1983.Pennies
#' \item Canadian.Pennies
#' \item Pre.1964.Quarters
#' \item Post.1964.Quarters
#' \item Dollar.Coins
#' }
#'
#' @format A data frame with 40 rows and 8 variables
#' @source Triola, M. 2014. Elementary Statistics, 12th ed. Boston, MA: Pearson.
#' @name ds21
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