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11 Nov 2019
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 0.785, 0.746, 0.822,0.844, and 0.774 ppm Cd^2+. Calculate the mean (x), standard deviation (s_x) and the 95% confidence interval for this data set. A list of t values can be found in the Student table. Does the new method give a result that differs from the known result of the SRM at the 95% confidence level? Yes No
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 0.785, 0.746, 0.822,0.844, and 0.774 ppm Cd^2+. Calculate the mean (x), standard deviation (s_x) and the 95% confidence interval for this data set. A list of t values can be found in the Student table. Does the new method give a result that differs from the known result of the SRM at the 95% confidence level? Yes No
Tod ThielLv2
26 Feb 2019