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6.38. The viscosity of a polymer is measured hourly. Measurements for the last 20 hours are shown in Table 6E.12. TABLE 6E.12 Viscosity Data for Exercise 6.38 Test Viscosity Test Viscosity 1 2,838 11 3,174 2 2,785 12 3,102 3 3,058 13 2,762 4 3,064 14 2,975 5 2,996 15 2,719 6 2,882 16 2,861 7 2,878 17 2,797 8 2,920 18 3,078 9 3,050 19 2,964 10 2,870 20 2,805 6.50. Reconsider the polymer viscosity data in Exercise 6.38. Use the median of the span-two moving ranges to estimate o and set up the individuals control chart. Compare this chart to the one originally constructed using the average moving range method to estimate o. a. Does viscosity follow a normal distribution? b. Set up a control chart on viscosity and a moving range chart. Does the process exhibit statistical control? c. Estimate the process mean and standard deviation