Drug content assessment. Refer to Exercise 4.123 (p. 245) 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 table below. The scientists want to know whether there is any difference between the
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