4. A quality inspector took five samples, each with four observations, of the length of a...
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4. A quality inspector took five samples, each with four observations, of the length of a part (in centimetres). She computed the mean of each sample (see table below). a. Use the following data to obtain three sigma (i.e., z = 3) control limits for sample mean. Is the process in control? b. If a new sample (sample 6) has values 12.10, 12.19, 12.12, and 12.14, using the sample mean control chart in part a, has the process mean changed (i.e., is there an assignable variation)? It is known from previous experience that the standard deviation of the process is 0.02 cm. Observation 1 2 3 4 X 1 12.11 12.10 12.11 12.08 12.10 2 12.15 12.12 12.10 12.11 12.12 Sample 3 12.09 12.09 12.11 12.15 12.11 4 12.12 12.10 12.08 12.10 12.10 5 12.09 12.14 12.13 12.12 12.12 4. A quality inspector took five samples, each with four observations, of the length of a part (in centimetres). She computed the mean of each sample (see table below). a. Use the following data to obtain three sigma (i.e., z = 3) control limits for sample mean. Is the process in control? b. If a new sample (sample 6) has values 12.10, 12.19, 12.12, and 12.14, using the sample mean control chart in part a, has the process mean changed (i.e., is there an assignable variation)? It is known from previous experience that the standard deviation of the process is 0.02 cm. Observation 1 2 3 4 X 1 12.11 12.10 12.11 12.08 12.10 2 12.15 12.12 12.10 12.11 12.12 Sample 3 12.09 12.09 12.11 12.15 12.11 4 12.12 12.10 12.08 12.10 12.10 5 12.09 12.14 12.13 12.12 12.12
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Answer a To obtain three sigma control limits for sample mean we first need to calculate the average ... View the full answer
Related Book For
Fundamentals Of Corporate Finance
ISBN: 9780135811603
5th Edition
Authors: Jonathan Berk, Peter DeMarzo, Jarrad Harford
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