Statistical Methods In Analytical Chemistry (ch... -

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

The "outlier" test. It helps you statistically justify discarding a data point that looks wildly different from the rest. 4. Calibration and Linear Regression Statistical Methods in Analytical Chemistry (Ch...

): The average. This is your best estimate of the "true" value after multiple trials. This measures precision . A low means your replicates are tightly clustered; a high means your technique is inconsistent. Before complex modeling, you have to understand the

The lowest concentration at which we can perform a quantitative measurement with acceptable precision. 6. Confidence Intervals (CI) This measures precision

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

Errors that have a definite cause (e.g., an uncalibrated pipette). These affect accuracy —how close you are to the true value.

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.