21 Drug content assessment. Analytical Chemistry (Dec.

15, 2009) conducted a study in which scientists used high-performance liquid chromatography to determine the amount of drug in a tablet. Twenty-five tablets were produced at each of two different, independent sites.

Drug concentrations (measured as a percentage) for the tablets produced at the two sites are listed in the accompanying table and saved in the DRUGCON file. The scientists want to know whether there is any difference between the mean drug concentration in tablets produced at Site 1 and the corresponding mean at Site 2. Use the MINITAB printout above to help the scientists draw a conclusion.

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Two-Sample T-Test and CI: Content, Site Two-sample T for Content Site N Mean StDev SE Mean 25 89.55 3.07 1 2 25 89.03 3.34 0.61 0.67 Difference mu (1) mu (2) Estimate for difference: 0.515 95% CI for difference: (-1.308, 2.338) T-Test of difference = 0 (vs not =): T-Value = 0.57 P-Value 0.573 Both use Pooled StDev = 3.2057 DF = 48