Statistical Methods In — Analytical Chemistry (ch...

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

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. 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. Used to compare the precision (variances) of two

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

Analytical chemistry isn’t just about getting a number; it’s about knowing how much you can trust that number. Statistics provide the framework to quantify uncertainty and prove that your results are reliable. 1. Describing the Data (Central Tendency and Spread)

Instead of reporting a single number, chemists report a range. A 95% Confidence Interval tells the reader: "I am 95% sure the true value lies between X and Y." This accounts for both the mean and the uncertainty of the measurement.