Upload the data set called MATHSAT.SAV (in Start Here folder). Replicate the cor

Upload the data set called MATHSAT.SAV (in Start Here folder). Replicate the correlational/regression analyses that are described in Example 4.3 and Example 4.4.
Add the categorical variable, PCT30, to the scatterplot.
Do the analysis for each group separately as defined by the categorical variable (PCT30).
Write out the overall regression equation (you can do that in words, if you do not like or understand the statistical notation), as well as for each sub group (the two PCT30 groups). 
Define/explain the intercept and slope (beta coefficient) from each of the three regression models.