HW 9.3

5 10.117, 30.144

7 9.542, 40.289

9 a. (7.94, 23.66) b. (8.59, 20.63) where the width of the interval decreases c. (6.61, 31.36) where the width of the inverval increases

11 (1.612, 4.278) with 95% confidence

13 (849.7, 1655.3) with 90% confidence