Write a one-page essay (at most 12pts 1.5 space) on the pros and cons of push versus pull manufacturing systems.
tutor4helpyouQuality 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?
12 years ago
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