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P17_L26_Chocolate - OM335Fall2008 P17:chocolate...

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OM 335 Fall 2008 b8c977a875a8e62334ce5fa124f0b674c7c8f354.doc P17:  chocolate   A chocolate factory has weighed 4 chocolate truffles coming out of production over 5 working days to  obtain the following data, weights are in grams.  Mon Tue Wed Thu Fri 10am 30.50 30.30 30.15 30.60 30.15 11am 29.75 31.00 29.50 32.00 30.25 2pm 29.90 30.20 29.75 31.00 30.50 3pm 30.25 30.50 30.00 30.00 29.70 a) Group the data by day into five samples and find the sample average and range for each sample. b) Suppose the process has a mean of 30 and a standard deviation of 0.3. Construct the 3-sigma control  limits of the mean chart. Is the process mean under control? c) Suppose we do not know the mean and the standard deviation of the process. Construct the 3-sigma  control limits of the mean chart. Is the process mean under control? (Make use of Table A) d) Construct the control limits of the range chart. Is the process range under control? (Make use of Table  A) e) Suppose the process has a standard deviation of 0.2. The factory quality assurance requires rework 
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