CHM 2354 Study Guide - Midterm Guide: Human Chorionic Gonadotropin, Rare Earth Element, Coefficient Of Variation
22 Mar 2016
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0. 611 mg/l, 0. 591 mg/l, 0. 611 mg/l, 0. 579 mg/l, and 0. 619 mg/l. Determine the mean and 90% conidence interval for the average luoride concentraion in this sample. Report both the mean and conidence interval with three signiicant igures. Confidence interval: 0. 015 mg/l: a student researcher developed a novel analyical method for determining the lead (pb2+) content in waste water. To demonstrate the eicacy of the new method, the researcher measured the pb2+ concentraion in an unknown sample using the novel method (method 1). She then measured the same sample using the standard, convenional analyical method (method 2). The results of this experiment are shown below as the mean (x) and standard deviaion of the pb2+ concentraion in ppm. The number of replicate measurements (n) is also shown. Method 1: x1 = 3. 780 ppm s1 = 0. 190 ppmn1 = 6. Method 2: x2 = 3. 930 ppm s2 = 0. 140 ppmn2 = 6.
