Statistical Methods In Analytical Chemistry | (ch...

Analytical chemists use these tests to determine if a difference in results is "real" or just a fluke of random error.

Used to compare the precision (variances) of two different methods. It tells you if one method is significantly more "reproducible" than another.

Inherent fluctuations in any measurement. These affect precision . These errors typically follow a Gaussian (Normal) Distribution , forming the classic bell curve. 3. Significance Testing (The "Decision Makers") Statistical Methods in Analytical Chemistry (Ch...

The "outlier" test. It helps you statistically justify discarding a data point that looks wildly different from the rest. 4. Calibration and Linear Regression

Used to compare a measured mean to a known value, or to compare two sets of means to see if two methods yield the same result. Analytical chemists use these tests to determine if

A method to find the "best-fit" line ( ) for your calibration standards. Correlation Coefficient ( R2cap R squared

): Indicates how well your data fits that linear model. In analytical work, we usually look for 5. Limits of the Method Statistics define the "floor" of what an instrument can do: Inherent fluctuations in any measurement

Before complex modeling, you have to understand the "shape" of your results. Mean (