S09-HW Soln-Ch16

# S09-HW Soln-Ch16 - Chapter 16: Quality Control and SPC...

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Chapter 16: Quality Control and SPC Homework Problems and Solutions #1: Thirty samples of size 3 resulted in an overall mean of 16.51 and average range of 1.30. Compute control limits for f8e5 x - and R -charts. #2: Use the sample data below to construct f8e5 x - and R -charts. Assume that the sample size is 5: Sample x R Sample x R 1 95.72 1.0 11 95.80 0.6 2 95.24 0.9 12 95.22 0.2 3 95.18 0.8 13 95.56 1.3 4 95.44 0.4 14 95.22 0.5 5 95.46 0.5 15 95.04 0.8 6 95.32 1.1 16 95.72 1.1 7 95.40 0.9 17 94.82 0.6 8 95.44 0.3 18 95.46 0.5 9 95.08 0.2 19 95.60 0.4 10 95.50 0.6 20 95.74 0.6 #3: Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n=20 observations have been obtained and the sample means and ranges computed. Determine upper and lower control limits for mean and range charts. Is this process in control? Sample Mean Range 1 3.06 0.42 2 3.15 0.50 3 3.11 0.41 4 3.13 0.46 5 3.06 0.46 6 3.09 0.45 #4: A medical facility does MRIs for sports injuries. Occasionally a test yields inconclusive results and must be repeated. Using the following sample data and n=200, determine the upper and lower control limits. Is the process in control? SAMPLE 1 2 3 4 5 6 7 8 9 10 11 12 13 Number of retests 1 2 2 0 2 1 2 0 2 7 3 2 1 #5: The postmaster of a small western town receives a certain number of complaints each day about mail delivery. Determine control limits using the following data. Is the process in control? DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 No. of complaints 4 10 14 8 9 6 5 12 13 7 6 4 2 10 1

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Chapter 16: Quality Control and SPC Homework Problems and Solutions #6: Given the following data for the number of defects per spool of cable, is the process in control?
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## This note was uploaded on 10/19/2009 for the course OMSE 0910 taught by Professor Staff during the Spring '08 term at University of Arizona- Tucson.

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S09-HW Soln-Ch16 - Chapter 16: Quality Control and SPC...

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