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problemset_2008-8_key

# problemset_2008-8_key - Problem Set 7 EMA 4714 Materials...

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Unformatted text preview: Problem Set 7 EMA 4714 - Materials Selection and Failure Analysis KEY Due Wednesday, March 27, 2002 - 11:45 am Dieter Exercise 10.9 If 10 percent of the parts produced by a screw machine are defective, what is the probability that, out of 5 parts selected at random, none of the parts will be defective? ************************************************************************** probability of a defective part, p = 0.10; r = 0 probability of a good part, q = 1 - p = 0.90; n = 5 infinite population, binomial distribution assumed: P(r=0) = [5!][0.1) (0.9) 5 /[0!(5-0)!] = 0.59 Dieter Exercise 10.13 In an experiment to determine whether there is an effect of specimen diameter on RAT [reduction in area, tensile test], the following data were obtained: Is the difference in the means for the two tests statistically significant? [Note that the variances are not significant different.] ************************************************************************** H : μ 1- μ 2 = d = 0 where 1 = 0.252-inch diameter, 2 = 0.505-inch diameter specimens= d = 0 where 1 = 0....
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problemset_2008-8_key - Problem Set 7 EMA 4714 Materials...

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