ENMA 420(520) Mid-Term Exam 2009 10 16

ENMA 420(520) Mid-Term Exam 2009 10 16 - ENMA 420/520...

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/ ENMA 420 520 Statistical Concepts for Engineering Management - Mid Term Exam : Notes - - ; , This mid term is open reference however all work done must . be entirely your own . There are 12 problems on 5 pages 1. ( ). Airborne benzene is measured in parts per million PPM , Here it is represented by a random variable Y which takes on , , , … , values from 0 1 2 1000000 and can be approximated . by a Poisson distribution Federal standards for allowable . benzene levels are 1 ppm a. Suppose petrochemical plants in general have a mean . level of benzene of 5 ppm What is the probability a specific plant exceeds the government standard? b. ( ) . Repeat part a given a mean value for all plants of 2 5 . ppm c. % - A Gulf Oil study indicated that 88 of benzene using . industries expose their worker to 1ppm or less Suppose you randomly sample 55 of these industries and determine . the number Y which are in violation of the standard Use the Poisson approximation to the binomial distribution to find the probability that none of the sampled industries . violates the government standard Compare this probability to the exact probability computed using the . binomial distribution 2. Steel water pipelines may use cement mortar linings to . prevent corrosion One study of a particular project specified / . 7 16 inch mortar thickness A very large number of thickness . measurements produced a mean of 0 635 inches and a . . standard deviation of 0 082 inches What percentage would / you say were less than 7 16 inch? 3. , For the data in the file GASTURBINE calculate the coefficients , , - of correlation between the variables RPM CPRATIO INLET
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, - , , , , %, TEMP EXH TEMP AIRFLOW POWER HEATRATE LHV and . ISOWORK What relationships appear to be significant?
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4. - Shear block test on epoxy repaired timber indicate that the - ,
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ENMA 420(520) Mid-Term Exam 2009 10 16 - ENMA 420/520...

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