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

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

This preview shows pages 1–4. Sign up to view the full content.

/ 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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
, - , , , , %, TEMP EXH TEMP AIRFLOW POWER HEATRATE LHV and . ISOWORK What relationships appear to be significant?
4. - Shear block test on epoxy repaired timber indicate that the - ,

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online