PRACTICE 4 (12 pts ); 1) Use the PROC PRINT step to list the rows for * variables DayVisits TentCampers and RVCampers in *; HW2.NP_SUMMARY where DayVisits is greater than *; or equal to 300,000 and Reg is equal to IM. ; (4 pts) ; 2) How many observations are listed (1pt) *; 3) Write two \%LET statements to create macro *; variables named Visits and Region. Set the *; initial values of the variables to match the ; where statement. (2 pts) *; 4 ) Copy the code in part 1 ) and modify the WHERE *; statement to reference the macro variables. ; Run the code and verify if the same results are ; produced. ( 2 pts ) *; 5) Copy the code in parts 3 ) and 4 ). ; Change the values of the macro variables to ; 500,000 and SE. Run the code and how many *; observations are listed. (3 pts) *