Question Number 5: A course in Statistics is taught to two different groups.Group-1 sample consist of 15 students while Group-2 sample consist of 14students .At the end of the semester

the same examination was given to each group. The 15 students meeting in the class room made an average grade of 87with a standard deviation of 7, while the 14 students using programmed materials made an average of 80 with a standard deviation of 5. Find a 95%confidence interval for the difference between the population means.