Refer to the Analytical Chemistry (Dec. 15, 2009) study of a method—called high performance liquid chromatography—of determining the amount of drug in a tablet, Exercise 5.45. Assume the data in the accompanying table represent the drug concentrations (measured as a percentage) in tablets selected from two different production sites, one tablet selected each hour for 25 consecutive hours at each site. Use control chart methodology to monitor the drug content assessment process at each site. Is the process in statistical control at both sites?

Data from Exercise 5.45

Scientists at GlaxoSmithKline Medicines Research Center used high-performance liquid chromatography (HPLC) to determine the amount of drug in a tablet produced by the company. (Analytical Chemistry, Dec. 15, 2009.) Drug concentrations (measured as a percentage) for 50 randomly selected tablets are listed in the accompanying table and saved in the DRUGCON file.

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DRUGCON Site 1 91.28 92.83 89.35 91.90 82.85 94.83 89.83 89.00 84.62 86.96 88.32 91.17 83.86 89.74 92.24 92.59 84.21 89.36 90.96 92.85 89.39 89.82 89.91 92.16 88.67 Site 2 89.35 86.51 89.04 91.82 93.02 88.32 88.76 89.26 90.36 87.16 91.74 86.12 92.10 83.33 87.61 88.20 92.78 86.35 93.84 91.20 93.44 86.77 83.77 93.19 81.79