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. (2) The tutoring services in the math lab are improving student performance on math exams. (3) To improve student performance in math classes, the college should require students to attend the math lab