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Session_8_Homework_Problems_2
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Session 8 Homework Problems #2

1. The following data are the production units from a manufacturing line for the past 5 weeks.  The manager wants to know if the process is stable and in control.  Produce X-bar and R charts and comment on the process
 Week Monday Tuesday Wednesday Thursday Friday 1 12 15 8 7 10 2 6 9 11 13 7 3 15 11 9 6 12 4 8 7 6 11 14 5 20 12 10 5 14 6 13 10 9 8 12 7 10 14 11 8 5 8 10 15 17 11 9

1. The internal diameter of a cylinder must be 60 centimeter.  The tolerance is  +1 and 0.5 centimeter.  If the mean value of the process is 60.4,
•  Calculate the process capability index and indicate if the process is capable.
• Calculate the % of the cylinders produced that will meet the specifications
• What should be the standard deviation in order for the process to be capable

1. A product has specification limits of 18 to 20.  If the process mean is 19.2 and the standard deviation is 0.6, calculate
1. the process capability for this production line.
2. What % of the products are out of specs

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