Quality Control Charts

Submit your answers to the following three problems listed below. Note: Chapter 8 problem data are given in Student Resource –Case and Problem Data. For your convenience, I have attached the data needed for problems 27, 28, 41, 42 and 43 herewith.

  1. Problem 28 [See attached data].
  2. Problem 40 [Needed data given in the problem].
  3. Problem 43 on pages 445 – 446. [See attached data].

Due February 23 at 11:55 p.m.

Important: Before you work on the assignments to be submitted do the following:

  1. Study Example 8.15 — Constructing X- and R-charts for variables on page 408 and the example problem X- and R-chart attached in Lessons. [Note: The values for A2, D3 and D4 are given in Appendix B of the text. The columns you want to use are A2 for x-charts and D3 and D4 for R-charts.For your convenience, the values for A2 for x-charts and D3 and D4 for R-charts are also given in the attached example.]
  2. Study Example 8.18 — Constructing a p-chart for attributes on page 421. See the steps for using the Excel template below:

    Step 1: Open the Excel Template given in the attachment below.

Step 2: Enter the # defectives in the yellow cell on the left column.

Step 3: Enter the sample size (i.e., total number inspected each time a sample is taken) on the yellow cell on the right column. [Note: sample size is 400 for all 12 samples]

You will see the value for the P-bar (the Center line) (0.0175) as well as the value for the Upper Control Limit (0.0372) and the Lower Control Limit (zero).

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