A tutoring company claims that attending their preparatory classes would improve students' performance on a widely used standardized test. One year. a check box was added to the test for students to indicate whetherthey attended preparatory classes. Researchers selected a random sample of 1,000 tests. The sample mean score for the 257 students who attended preparatory classes was 592 with a sample standard deviation of 72. The sample mean score forthe 743 students who did not attend preparatory classes was 571 with a sample standard deviation of 164. Determine the degrees of freedom for a two-mean hypothesis test for population variances assumed unequal {nonpooled estimate ofthe standard deviation} to test whether the population mean score of students who attended preparatory classes is greater than for those who did not attend the classes. Provide your answer below: df=m