Each month, the quality control engineer at a bottle manufacturing company randomly selects one finished bottle from the production process at 20 points in time (days) and records the weight of each bottle (in ounces). The data for last month’s inspection are provided in the next table.

a. Construct a variable control chart for the weights of the finished bottles.

b. Does the process appear to be in control for this particular month?

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ВOTTLE Day Weight Day Weight 5.6 11 6.2 5.7 12 5.9 6.1 13 5.2 4 6.3 14 6.0 5.2 15 6.3 6. 6.0 16 5.8 7 5.8 17 6.1 8. 5.8 18 6.2 9. 6.4 19 5.3 10 6.0 20 6.0 1 23