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

a. Descriptive statistics for the drug concentrations are shown at the top of the following SPSS printout on p. 260.
SPSS Output for Exercise 5.68

Use this information to assess whether the data are approximately normal.
b. An SPSS normal probability plot is shown above. Use this information to assess whether the data are approximately normal.

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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 89.35 86.51 89.04 91.82 93.02 88.32 88.76 89.26 90.36 8716 91.74 86.12 92.10 83.33 8761 88.20 92.78 86.35 93.84 91.20 93.44 86.77 83.77 93.19 81.79 Descriptives Std. Eror .45021 Statistic Content Mean 88.2906 95% Confidence Interval for Mean Lower Bound 88.3859 Upper Bound 90.1953 5% Trimmed Mean 88.3963 Median 88.3750 Variance 10.134 Std. Deviation 3.18344 Minimum 81.79 Maximum 94.83 Range 13.04 Interquartile Range 4.84 Skewness -.544 337 Kurtosis -.389 562