Small Boxes of FiberBlast Cereal are labeled “net weight 10 ounces.” Each hour random samples of 5 boxes are weighed to check process control. Ten hours of observations yielded the following data:
Hourly Samples
1 2 3 4 5 6 7 8 9 10
10 9 13 10 12 10 10 13 8 10
9 12 9 10 10 10 11 10 8 12
10 11 10 11 9 8 10 8 12 9
9 11 10 10 11 12 8 10 12 8
12 10 9 10 10 9 9 8 9 12
1. calculate each sample mean, sample range, grand mean, average range, upper and lower control limits.