Data for Exercise 9.24, Example 9.1, and Example 9.6
A data frame/tibble with 51 observations on four variables
a factor with levels
SAT math scores for high school seniors
math proficiency scores for eigth graders
a numeric vector
National Assessment of Educational Progress and The College Board.
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
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