An instructor believes that students do not retain as much information from a lecture on a Friday compared to a Monday. To test this belief, the instructor teaches a small sample of college students some preselected material from a single topic on statistics on a Friday and on a Monday. All students received a test on the material. The differences in exam scores for material taught on Friday minus Monday are listed in the following table.

Difference Scores

(FridayMonday)

+4.5

+6.4

+3.3

+0.9

1.5

(a) Find the confidence limits at a 95% CI for these related samples. (Round your answers to two decimal places.)

____________to_____________

(b) Can we conclude that students retained more of the material taught in the Friday class?

• Yes, because 0 lies outside of the 95% CI.
• No, because 0 is contained within the 95% CI.