Question

In: Statistics and Probability

Results from the last four samples from a process are shown in the table. Calculate control...

Results from the last four samples from a process are shown in the table. Calculate control limits for an R and X chart. Determine whether the process is in statistical control.

Sample number

Observation 1

Observation 2

Observation 3

Observation 4

1

5

5.01

4.9

5

2

5.01

5.02

4.98

5

3

5.02

5.07

4.99

4.98

4

4.9

4.92

5.01

5.23

To control the lead time of a process, samples of size ten are taken from the process. If the average time to complete the process is three days, with a standard deviation of 0.5 days. Calculate the control limits for an X chart at 3 sigma level.

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Expert Solution

orchestra answered 3 years ago
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