The Analytical Chemistry (Dec. 15, 2009) study in which HPLC 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 table below. 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 accompanying Minitab printout to help the scientists draw a conclusion.
Site 1

Site 2

Two-Sample T-Test and CI: Content, Site
Two-sample T for Content

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 DF = 48 both use Pooled StDev = 3.2057
Minitab output for Exercise 8.16
For Information: Refer to Exercise 4.123

91.28 9283 89.35 91.90 82.85 9483 89.83 89.00 84.62 86.96 88.32 91.17 83.86 89.74 92.24 2.59 8421 89.36 0.96 92.85 89.39 89.82 89.91 92.16 88.67 89.35 S6.51 89.04 9182 93.02 88.32$8.76 926 90,36 8716 91.74 86.12 92.10 83.33 8761 88.20 92.78 86.35 3.84 91.20 93,44 86.77 83.77 93.19 81.79 Site N Mean StDev SE Mean 1 25 89.55 3.07 0.61 2 25 89.03 3.34 0.67