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Question
Choose the correct alternative:
R is calculated using
Options
xmax – xmin
xmin – xmax
`bar"X"_"max" - bar"X"_"min"`
`\overset{==}{"X"}_"max" - \overset{==}{"X"}_"min"`
Solution
xmax – xmin
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RELATED QUESTIONS
Define Statistical Quality Control
Define the mean chart
Define R chart
Write the control limits for the mean chart
Write the control limits for the R chart
A quality control inspector has taken ten ” samples of size four packets each from a potato chips company. The contents of the sample are given below, Calculate the control limits for mean and range chart.
| Sample Number | Observations | |||
| 1 | 2 | 3 | 4 | |
| 1 | 12.5 | 12.3 | 12.6 | 12.7 |
| 2 | 12.8 | 12.4 | 12.4 | 12.8 |
| 3 | 12.1 | 12.6 | 12.5 | 12.4 |
| 4 | 12.2 | 12.6 | 12.5 | 12.3 |
| 5 | 12.4 | 12.5 | 12.5 | 12.5 |
| 6 | 12.3 | 12.4 | 12.6 | 12.6 |
| 7 | 12.6 | 12.7 | 12.5 | 12.8 |
| 8 | 12.4 | 12.3 | 12.6 | 12.5 |
| 9 | 12.6 | 12.5 | 12.3 | 12.6 |
| 10 | 12.1 | 12.7 | 12.5 | 12.8 |
(Given for n = 5, A2 = 0.58, D3 = 0 and D4 = 2.115)
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Variations due to natural disorder is known as
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The assignable causes can occur due to
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A typical control charts consists of
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The LCL for R chart is given by
