What is the purpose of a control chart

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Reference no: EM13747463

Quality Control

1. Write a one-page essay (at most 12pts 1.5 space) on the pros and cons of push versus pull manufacturing systems.

2. What is the purpose of a control chart?

3. Briefly explain the purpose of each of the following control charts

a. X-bar

b. Range

c. p-chart

d. c-chart

4. The time spent in a local medical clinic is to be investigated. Historically, the process has had a standard deviation equal to .146. The means of 39 samples of n=14 are:

Sample	Mean	Sample	Mean	Sample	Mean	Sample	Mean
1	3.86	11	3.88	21	3.84	31	3.88
2	3.9	12	3.86	22	3.82	32	3.76
3	3.83	13	3.88	23	3.89	33	3.83
4	3.81	14	3.81	24	3.86	34	3.77
5	3.84	15	3.83	25	3.88	35	3.86
6	3.83	16	3.86	26	3.9	36	3.8
7	3.87	17	3.82	27	3.81	37	3.84
8	3.88	18	3.86	28	3.86	38	3.79
9	3.84	19	3.84	29	3.98	39	3.85
10	3.8	20	3.87	30	3.96

a) Construct an x bar-chart for this process with three-sigma limits. Is the process in control?

b) Analyze the data using a median run test and an up/down run test. What can you conclude?

Reference no: EM13747463

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