The datasets and variable lists are to be used to answer the exercises in the text.
DATA_D~1
DATA_D~2
DATA_G~1
DATA_M~1
DATA_P~1
DATA_P~2
DATA_P~3
DATA_Q~1
DATA_R~1
DATA_S~1
DATA_S~2
DATA_S~3
DATA_S~4
DATA_W~1
DATA_W~2
DATA_Y~1
DATA_Y~2