R-charts and decide in-control process

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Reference no: EM13122293

Small boxes of NutraFlakes cereal arelabeled "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 BOX 1 BOX 2 BOX 3 BOX 4

9 A.M 9.8 10.4 9.9 10.3

10 A.M 10.1 10.2 9.9 9.8

11 A.M 9.9 10.5 10.3 10.1

NOON 9.7 9.8 10.3 10.2

1 P.M 9.7 10.1 9.9 9.9

Usind these data, construct for x- and R-charts. Is the process in control? What other steps should the QC department follow at this point?

Reference no: EM13122293

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