HW6 (blank)

# HW6 (blank) - follows Sample Number Defective 1 1 2 3 3 2 4...

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Brittany Braud Management 368 Homework 6 June 14, 2011 1. Chapter 6 - # 6: The Awake Coffee Company produces gourmet instant coffee. The company wants to be sure that the average fill of coffee containers is 12.0 ounces. To make sure the process is in control, a worker periodically selects at random a box of 6 containers of coffee and measures their weight. When the process is in control, the range of the weight of coffee samples averages 0.6 ounces. a.) Develop an R-chart and an x-chart for this process. b.) The measurement of weight from the last 5 samples taken of the 6 containers follow: Sample x R 1 12.1 0.7 2 11.8 0.4 3 12.3 0.6 4 11.5 0.4 5 11.6 0.9 Is the process in control? Explain your answer.

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2. Chapter 6 - # 8 A tire manufacturer has been concerned about the number of defective tires found recently. In order to evaluate the true magnitude of the problem, a production manager selected 10 random samples of 20 units each for inspection. The number of defective tires found in each sample are as

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Unformatted text preview: follows: Sample Number Defective 1 1 2 3 3 2 4 1 5 4 6 1 7 2 8 9 3 10 1 a. Develop the p-chart with a z = 3 b. Suppose that the next four samples selected had 6, 3, 3, and 4 defects. What conclusion can you make? 3. Chapter 6 - # 10 University Hospital has been concerned with the number of errors found in its billing statement to patients. An audit of 100 bills per week over the past 12 weeks revealed the following number of errors: Week Number of Errors 1 4 2 5 3 6 4 6 5 3 6 2 7 6 8 7 9 3 10 4 11 3 12 4 a. Develop control charts with z = 3 b. Is the process in control? 4. Chapter 6 - # 12 Compute the C pk measure of process capability for the following machine and interpret the findings. What value would you have obtained with the C p measure? Machine Data: USL = 100 LSL = 70 Process σ = 5 Process μ = 80...
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HW6 (blank) - follows Sample Number Defective 1 1 2 3 3 2 4...

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