10. The data below show the average number of hours certain students slept per day when they took college courses either in-person or remotely. Student 1 2 3 4 5 6 7 8 9 In-Person 6.5 7.0 9.0 8.0 7.5 7.0 8.0 5.5 7.5 Remote 8.0 7.0 10.0 7.5 8.0 8.0 9.0 7.5 8.5 a. How many of the students slept more per day while taking courses in-person? (1 pt) b. How many of the students slept more per day while taking courses remotely? (1 pt) C. Construct a 90% confidence interval for the true mean difference in the average number of hours slept per day for students taking courses in these two formats. (7 pts) d. What information does your interval provide about the true mean difference? (4 pts) 11. Explain why confidence intervals for population means that require the value of the population standard deviation (@) are unrealistic. (3 pts)