representation. n. 1. the act or an instance of representing or the state of being represented. 2. anything that represents, such as a verbal or pictorial portrait. 3. anything that is represented, such as an image brought clearly to mind.
The standard deviation and range are both measures of the spread of a data set. Each number tells us in its own way how spaced out the data are, as they are both a measure of variation. The range relies on a very simple formula of subtracting the minimum data value from the maximum.
Go directly to Critical Values. REFERENCE RANGES. Reference Ranges (ânormal limitsâ) are usually determined by taking either the lowest and highest values (range) of results obtained on a normal population, the mean 2 standard deviations (S.D.) of the values obtained on a large population or the central 95% range.o directly to Critical Values. REFERENCE RANGES. Reference Ranges (ânormal limitsâ) are usually determined by taking either the lowest and highest values (range) of results obtained on a normal population, the mean 2 standard deviations (S.D.) of the values obtained on a large population or the central 95% range.