CHM217H1 Lecture Notes - Standard Deviation, Calcite, Pipette
Document Summary
Resolution: ability to discriminate between different values (ie. cm, mm, decimal place) Measurement error (e): difference between measured (xm) and true (xtrue) values: true value should be known, can use conventional or accepted true value (i. e. = 3. 14) Uncertainty (u): our estimate of the likely error in xm: more realistic to use uncertainty (to it more times) Mean: -ex when xm is an average value. Standard of reference for calibration: determines quality (usefulness) of measurement, determines quality (usefulness) of results. Systematic: - all results either too high / low are errors that always have the same magnitude and sign, resulting in a bias of the measured values from the true value. An example would be a ruler missing the first 1 mm of its length it will consistently give lengths that are 1 mm too short. Systematic errors affect the accuracy of the final result.
