Chapter 6.7, Problem 6.101ACI

Drug content assessment. Refer to the Analytical Chemistry (Dec. 15, 2009) study of a new method used by GlaxoSmithKline Medicines Research Center to determine the amount of drug in a tablet, Exercise 4.123 (p. 245). Drug concentrations (measured as a percentage) for 50 randomly selected tablets are repeated in the accompanying table. For comparisons against a standard method, the scientists at GlaxoSmithKline desire an estimate of the variability in drug concentrations for the new method. Obtain the estimate for the scientists using a 99% confidence interval. Interpret the interval.

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	8876	89.26	90 36	87 16	91 74
86.12	92 10	83.33	87.31	88.20	92.78	86.35	9384	91.20
93 44	86 77	83 77	93.19	81.79