STATA exercise: We will work with the variables math scr, a school's average math score among students; meal pct, the percent of students eligible for reduced price lunch in that school; and comp stu, the number of computers per student in a school.

Create the state command to: Test that a school with no students eligible for reduced price lunch that has 0.2 computer per student gets worse math outcomes on average than a school with 20 percent of students eligible for reduced price lunch that has 0.4 computers per student. Use a 5% significance level and a lincom command.