To determine whether glaucoma affects the corneal thickness, measurements were made in 8 people affected by glaucoma in one eye but not in the other. The corneal thicknesses (in microns) were as follows: Person 1 8 2 3 4 5 6 7 480 426 440 410 459 Eye not affected by glaucoma 484 478 492 444 436 398 464 476 Eye affected by glaucoma 488 478 460 (a) (8 points) Use the R script to test whether the mean corneal thickness is different for people affected by glaucoma in one eye but not in the other at a = 0.10. (b) (4 points) Calculate a 90% confidence interval for the mean difference in thickness.