Refer to the data of Exercise 11.8. a. Calculate a 95% confidence interval for 1. b. What

Refer to the data of Exercise 11.8.
a. Calculate a 95% confidence interval for β1.
b. What is the interpretation of H0: β1 = 0 in Exercise 11.8?
c. What is the natural research hypothesis Ha for the problem in Exercise 11.8?
d. Do the data support the research hypothesis from part (c) at a = .05?
In exercise

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Noltems 11 Time 1 2 2 22 2 33 3 3 4.8 14.7 13.7 9.5 24 118 10.5 12.0 14.3 16.4 17.9 145 16.7 20.1 168 Noltems 3 3 3 3 3 44 44 4 45 Time 208 26.8 12.9 130 15.4 108 20.3 22.3 20.0 219 20.7 20.9 19.9 17.1 19.1 Noltems 5 5 55 6 666 66 6 77 7 7 Time 17.2 181 17.9 129 19.6 27.9 22.2 23.2 17.5 15.3 21.8 17.9 20 18.9 29.3 Noltems 7 88 88 889999 90 10 10 Time 21.5 26.5 28.2 251 26.1 28.2 22.3 21.8 25.5 244 18.1 26.7 24.6 30.1 215 Time 25.2 28.2 22.6 313 27.2 28.8 29.7 34.3 279 29.7 28.7 34.6 380 28.0 37.0 Noltems 17 18 18 18 19 20 21 22 23 24 25 25 25 26 27 Time 32.5 39.5 39.0 37.0 35.5 38.3 44.0 39.6 42.3 34.6 44.9 474 49.2 45.8 44.0 Noltems 27 30 30 31 37 39 40 45 46 Time46.1 42.9 48.3 46.0 48.2 54.7 49.9 55.4 57.1 52.4