#' @title fake exam grade data
#' @docType data
#' @keywords datasets
#' @name grades
#' @usage data(grades)
#' @format A data frame of fake data with 100 rows and 3 variables:
#' \describe{
#' \item{anxiety}{Anxiety rating}
#' \item{preparation}{Preparation rating}
#' \item{exam}{Exam grade}
#' }
"grades"
NULL
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