In a test to compare the average LSAT (Law School Admission Test) scores for students who took one of three different prep courses for the exam, three samples of 21 students each were randomly selected to represent the three populations of students. The partially completed tables below summarize test score results. Fill in the indicated missing values. Do sample results provide sufficient evidence to reject a “no difference in mean LSAT scores” for the three populations of students represented? The significance level is 5%. Explain your reasoning.