Drug content assessment. Refer to Exercise 5.68

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and the Analytical Chemistry (Dec. 15, 2009) 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. 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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MINITAB Output for Exercise 9.23 Two-Sample T-Test and CI: Content, Site Two-sample I for Content Site N Mean StDev SE Mean 1 25 89.55 3.07 2 25 89.03 3.34 0.61 0.67 Difference = mu (1) - mu (2) 0.515 Estimate for difference: 95% CI for difference: (-1.308, 2.338) T-Test of difference = 0 (vs not =): T-Value = 0.57 P-Value = 0.573 DF = 48 Both use Pooled StDev 3.2057