1 Small boxes of NutraFlakes cereal are labeled “net weight 10 ounces.” Each hour, random samples of size n = 4 boxes are weighed to check process control. Five hours of observations yielded the following: WEIGHT TIME 9 a.m. 10 a.m. 11 a.m. Noon 1 p.m. BOX 1 9.8 10.1 9.9 9.7 9.7 BOX 2 10.4 10.2 10.5 9.8 10.1 BOX 3 9.9 9.9 10.3 10.3 9.9 BOX 4 10.3 9.8 10.1 10.2 9.9 Using these data, construct limits for x-and R-charts. Is the process in control? What other steps should the QC department follow at this point?
1 Small boxes of NutraFlakes cereal are labeled “net weight 10 ounces.” Each hour, random samples of size n = 4 boxes are weighed to check process…
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