CHEM 212 Lecture Notes - Lecture 4: Observational Error, F-Test
19 Sep 2016
School
Department
Course
Professor
Document Summary
How to use stats controls on calculator: stats mode. Rcl then xbar and sx clear= 2nd function ca. Make the same measurement many time aka replicates. Plot the data from measurements you will get normal gaussian distribution. +/- 1sd 68% within 1 std. dev of the mean. +/- 2 std. dev area is 95. 4% within mean. If the data set is large then the data set describes the population. Problem resulting 2 std. dev reports larger range thus less value in number. If data set is small then data describes a sample. * we use xbar and s to predict mu and sigma. Systematic error does not change to shape of the curve it changes the position along the x-axis. E ect of change in precision, std. dev changes but the mean does not change. Mu and sigma are the true values for the population. The larger the n, the better the sample estimates the population.
