Chemistry, 19.10.2019 01:20, shayambros
An environmental scientist developed a new analytical method for the determination of cadmium (cd^2+) in mussels. to validate the method, the researcher measured the cd^2+ concentration in standard reference material (srm) 2976 that is known to contain 0.82 plusminus 0.16 ppm cd^2+. five replicate measurements of the srm were obtained using the new method, giving values of 0.782, 0.762, 0.825, 0.838, and 0.761 ppm cd^2+. calculate the mean (bar x), standard deviation (s_x), and the 95% confidence interval for this data set. at list of t values can be found in the student's t table. x bar = s_x = 95% confidence interval = x bar plusminus does the new method give a result that differs from the known result of the srm at the 95% confidence level?
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