Observational Study:SAT.txt

Reference:David S. Moore, George P. McCabe, Introduction to the Practice of Statistics, Exercises 10, pp.704.
This file contain 60 students' SAT and ACT scores. The students are randomly selected. 
In U.S., the SAT and the ACT are two major standardized tests that colleges use to evaluate candidate. 
Most of the students just take one of these tests. Some of them take both. 
We can use these scores of the students who take both to analyze the relationship between these two scores.
Variable name: 
SAT: SAT scores; 
ACT: ACT scores