8. In a study, a random sample of 36 healthy college students deprived of one night's sleep received an array of tests inteneded to measure their thinking time, ucency, and exibility. The overal test...

8. In a study, a random sample of 36 healthy college students deprived of one night's sleep received an array of tests inteneded to measure their thinking time, ucency, and exibility. The overal test scores of those 36 students had a mean of x bar 63 and a standard deviation of s1=17 a random sample of 40 of students who received sleep prior to taking the test had a mean score of x2 bar 78 with a standard deviation of s2=20

Compute a 95% con dence interval for the diference in mean test scores u1-u2