A study of tutoring services at a community college shows a strong positive association between time spent in the math lab and math exam average. Decide whether or not each statement below is valid: (1) Students who spend more time in the math lab tend to have higher exam averages. [ Select] (2) The tutoring services in the math lab are improving student performance on math exams. [ Select ] (3) To improve student performance in math classes, the college should require students to attend the math lab. [ Select)