Making sense of measurements - 2:

In Part 1 of this two-part article we looked at the subject of measurement variation, and determined that most processes naturally vary according to the normal distribution curve, also known as the 'bell shaped' curve. We also discussed the ideas ofprecision and accuracy, and the different types of measurement (direct, indirect and null). In this final instalment we will discuss roeasurement errors and some of the arithmetic needed to overcome these difficulties. First, let us look at the variaus types of measurement error and their sources.