Measurement literacy for the laboratory
Interpret repeated measurements and uncertainty.
Work through repeated measurements, reporting limits and uncertainty so a colleague can tell what a result means and how it was obtained.
Explore replicate measurements →ILLUSTRATIVE REPEAT MEASUREMENTS
9.8 10.1 10.0 10.2 9.9
Mean · Sample SD · Coefficient of variation
From observations to interpretation
Data notesWhat Replicate Measurements Tell You About Precision and Trueness
Compare repeat injections with independent preparations. Calculate the sample standard deviation and document any difference from an assigned reference.
Not Detected vs. Below LOQ: How to Record Laboratory Results
Interpret LOD, LOQ and laboratory qualifiers, with examples of dilution, differing limits and data entry.
How to Report Expanded Measurement Uncertainty (with a Worked Example)
Identify the measurand, distinguish standard and expanded uncertainty, and apply the stated decision rule.
Open teaching materials
Replicate measurement datasets and worked statistics
Practice mean, sample standard deviation and coefficient of variation on six synthetic datasets, including mixed units, blank signals and a reference check.
Explore the examples and downloads →Original analysis · Frozen public export
What is recorded in 104 lab report entries?
Count populated fields, numbers, bounds and verdicts in a ChemVerify export. Inspect the data dictionary and reproduce every count.
Read the reporting-field case study →Explore replicate measurements
Enter repeat measurements and inspect the mean, sample standard deviation and coefficient of variation.