Question: 3. 10 Control charts can be useful to evaluate the degree of conformance to specifications. The management of IBM Inc. is concerned with the production

3. 10 Control charts can be useful to evaluate

3. 10 Control charts can be useful to evaluate the degree of conformance to specifications. The management of IBM Inc. is concerned with the production of a special metal screw used by several other companies. The diameter of the screw is critical. Data from five samples are shown in the accompanying table. The sample size is 4. Is the process in control? Find out by using X-bar chart & R-chart. (cues: A2 =0.729, D3=0, D4=2.282) Data for the X-bar and R-charts: observations of screw driver (in) Observations Sample Number 1 2 3 4 1 10 12 19 18 2 15 17 14 18 3 18 16 15 13 4 18 14 14 15 5 15 16 14 17

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