# Statistical Quality Control (ISS (Statistical Services) Statistics Paper IV): Questions 18 - 20 of 34

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## Question number: 18

» Statistical Quality Control » Control Charts » Variable

Essay Question▾

### Describe in Detail

A machine is manufacturing mica discs. Samples of size 5 are drawn every hour and their thickness in units are recorded as follows. On the basis of chart, Check whether the production is under control?

 Sample No. Observations 1 8 9 15 4 11 2 7 10 7 6 8 3 11 12 10 9 10 4 12 8 6 9 12 5 11 10 6 14 11 6 7 7 10 4 11 7 10 7 4 10 10 8 8 11 11 7 7 9 8 11 8 14 12 10 12 9 12 17 11 11 7 7 9 17 13 12 9 9 4 4 11 13 10 12 12 12 12 14 8 11 9 6 8 15 10 13 9 4 9 16 9 11 8 5 11

### Explanation

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## Question number: 19

» Statistical Quality Control » Control Charts » Variable

Essay Question▾

### Describe in Detail

a) If the average range for the 4 samples is 0.2 millimeters and the average mean of the observations is 12.5 millimeters, obtain the three-sigma control limits for the sample mean.

b) 5 observations have been taken from the10 samples in order to test the volume in the bags. The average sample range is 0.5 ounces. Obtain the 3-σ limits for the sample range.

### Explanation

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## Question number: 20

» Statistical Quality Control » Control Charts » Variable

Essay Question▾

### Describe in Detail

A new oven has been installed in a bakery and to test the efficiency of this, the oven temperature readings have been taken at four different places inside the oven every 30 min. The following table gives readings. Determine the control limits for the mean temperature.

 Time Readings 8: 00 400 500 550 390 8: 30 440 420 380 380 9: 00 410 450 470 430 9: 30 390 390 410 410 10: 00 370 420 460 410 10: 30 390 400 390 400

### Explanation

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