IOE
IOE265HW9

# IOE265HW9 - IOE 265 W2007 HW#9 Solutions Due Tue April 17...

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IOE 265 W2007 HW #9 Solutions Due: Tue April 17 by 5:30 PM (hand in to Ryan or Tim by the end of the last lab session) Please include your name, UM ID and lab section time in your written homework assignment. You may work with other students to discuss problem approaches and check answers, but you may not copy another’s work or refer to solutions from the Instructor’s manual or solutions from previous semesters. Please be sure to staple your assignment if it includes multiple pages. All problems are from the Devore text, 6 th edition. Required problems 1. (1.5 points) p. 337, problem #16. a. (0.5 point) α = P ( t 3.733 when t has a t distribution with 15 d.f.) =.001, because the 15 d.f. row of Table A.5 shows that t .001,15 = 3.733. b. (0.5 point) d.f. = n–1 = 23, so α = P ( t -2.500) = .01. c. (0.5 point) d.f. = 30, α = P ( t 1.697) + P ( t -1.697) = .05 + .05 = .10. 2. (3 points) p. 337, problem #18. a. (0.5 point) (72.3-75)/(9/sqrt(25)) = -1.5, or 1.5 standard deviations below the null value b. (0.5 point) For α = 0.01 and Ha: μ < 75, the critical value is –z.01 = -2.33.

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