Question: A quality inspector took five samples, each with 4 observations, of the length of time for glue to dry. Standard deviation of the process is

A quality inspector took five samples, each with 4 observations, of the length of time for glue to dry. Standard deviation of the process is .02 minutes according to previous experience. Use the information to construct Mean Chart. Do the results suggest that the result is in control? Write the detail interpretation.

A quality inspector took five samples, each with

Sample 1 15.11 15.10 15.20 15.09 Sample 2 15.18 15.14 15.10 15.07 Sample 3 15.09 15.04 15.11 15.20 Sample 4 15.12 15.10 15.08 15.05 Sample 5 15.09 15.14 15.13 15.08 + + No. of observations A2 D3 D4 3 1.02 0 2.57 4 0.73 0 2.28 5 0.58 O 2.11

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