ST 558 Homework 3

ST 558 Homework 3 - Kelly Harrison ST558 D Homework#3...

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Kelly Harrison ST558 D 5/7/10 Homework #3 PROBLEM 1 Ac ording to a study published by a group of University of Mas achuset s sociologists, ap roximately 60% of the Valium users in the state of Mas achuset s first to k Valium for psychological reasons. n = 8, p = .60 a) P(3) = C(8,3)(.60 3 )(.40 8-3 ) = .12386304 b) P(x   5) = P(5) + P(6) + P(7) = C(8,5)(.60 5 )(.40 8-5 ) + C(8,6)(.60 6 )(.40 8-6 ) + C(8,7)(.60 7 )(.40 8-7 ) =  .27869184 + .20901888 + .08957952 = .577290 PROBLEM 2 In testing a certain kind of truck tire over rough ter ain, it is found that 25% of the trucks fail to complete the test run without a blowout. n = 15, p = .25 a) P(3 to 6) = P(3) + P(4) + P(5) + P(6) = C(15,3)(.25) 3 (.75) 15-3  + C(15,4)(.25) 4 (.75) 15-4  + C(15,5)(.25) 5 (.75) 15-5  + C(15,6)(.25) 6 (.75) 15-6 = .225199 + .225199 + .165146+ .091748 = .70729 b) P(x < 4) = P(0) + P(1) + P(2) + P(3)
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This note was uploaded on 05/06/2010 for the course ST 558 taught by Professor Staff during the Spring '08 term at NMT.

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ST 558 Homework 3 - Kelly Harrison ST558 D Homework#3...

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