Variance and Standard Deviation

Skill Type Description Source
Variance and Standard Deviation Worksheet In this leaflet we introduce variance and standard deviation as measures of spread. We can evaluate the variance of a set of data from the mean, that is how far the observations deviate from the mean. MathCentre
Variance and Standard Deviation - Grouped Worksheet In this leaflet we extend the definitions of variance and standard deviation to data which has been grouped. MathCentre
Measures of Spread Worksheet On completion of this worksheet you should understand what is meant by a measure of spread and be able to calculate range, interquartile range and standard deviation Coventry University
Variance of a Population Video - 12:23 mins The video introduces how to calculate the variance for a population by hand. Khan Academy
Sample Variance Video - 11:17 mins The video introduces what the difference is between the population and the sample variances, and how to calculate the variance for a sample by hand. Khan Academy
Standard Deviation Video - 13:06 mins The video summaries what the difference is between the main estimators for a population and for a sample, and how to calculate the standard deviation by hand. Khan Academy
Alternate Variance Formulas Video - 12:17 mins The video introduces other formulas to calculate the variance which may simplify your calculations. Khan Academy
Variance of Differences of Two Random Variables Video - 10:46 mins The video introduces how to calculate the variance of the differences of two continuous random variables. This may be needed for a two-sample paired t test. Khan Academy


Enquries, feedback and comments to: Chetna.Patel@shef.ac.uk


23 February 09