Here are the questions:
(a) Run the regression with all years (Table 3 Column 1).
(c) Test if the coefficients on on-base percentage and slugging are equal.
(d) Rerun the regression for each year separately saving the coefficients on OBP and SLG for each year.

notes: table 3 column 1 is bpid (the variable name)
OBP and SLG are variable names.