CHEM 2121 Study Guide - Midterm Guide: Coefficient Of Variation, Propagation Of Uncertainty, Standard Deviation
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When you"re given +/- values, use the error propagation rules (first digit of uncertainty = last digit of actual answer) otherwise, just use normal sig fig rules. If need to propagate error and something doesn"t give it to you, just assume 1 in the digit of uncertainty. If fcalc < ftable, use spooled and tcalc w/ spooled, dof = n1 + n2 2. If fcalc > ftable, use tcalc which has separate s1 and s2, and then use. False positive: when concentration of analyte reported as exceeding some limit when in fact it = below limit; saying it"s above when it"s below. False negative: when concentration of analyte reported as being below some limit when in fact it"s above limit; saying it"s below when it"s above. Which one of these we want to eliminate depends on how we"re using the data: limit of detection (lod): smallest quantity of analyte that gives a signal that =
