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Required:

a. Determine the central line and control limits for limits for the range and mean chart plot the values?

b. Explain whether the sample indicate the presence of an assignable cause

c. The sample data for subsequent week had the values: 64, 71, 62 and 56. what conclusion can be reached about the state of the process? what should management do?

This is a subjective question, hence you 1. (20 marks) A component part for a motorcycle is manufactured by an investment casting process. The air vent opening on this casting is an important functional parameter of the part. The results for five samples are given in the table. The values given have been coded using the last two digits of the dimension Air vent opening diameter (in mm) 60 63 Sample 61 62 58 58 1 55 55 61 59 2 60 64 66 58 3 57 61 53 69 4 63 65 5