1.

A sample of 5 boxes was selected from a process each day for 12 days. The weight of each box (in ounces), along with the sample range and mean are shown below: Process Data Day Box1 Box2 Box3 Box4 Box5 Range Mean 1 28 31 28 29 28 3 28.8 2 27 28 34 33 29 7 30.2 3 33 29 33 29 30 4 30.8 4 34 30 33 32 33 4 32.4 5 29 34 34 34 32 5 32.6 6 27 29 29 33 31 6 29.8 7 32 34 30 31 32 4 31.8 8 29 27 30 27 33 6 29.2 29 29 32 33 27 6 30.0 10 29 29 33 27 32 6 30.0 11 28 29 27 28 32 5 28.8 12 32 29 27 28 29 5 29.0 Determine the control limits for the R-chart accurate to 2 decimal places. Table of Control Chart Constants a) Centreline = b) LCL = UCL = c) Based on these results, is the process variation in control? O Yes. There is a point beyond the control limits. O No. There is no point beyond the control limits. O No. There is at least one point beyond the control limits. O Yes. There is no point beyond the control limits