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Chapter 7 - Analysing the Data Part IV - Analysis of Variance Chapter 1 - Behavioural Science and research Chapter 2 - Research Design Chapter 3 - Collecting the Data Chapter 4 - Analysing the Data Part I - Descriptive Statistics Chapter 5 - Analysing the Data Part II - Inferential Statistics Chapter 6 - Analysing the Data Part III - Common Statistical Tests Frequency distributions Central tendancy Variability The normal distribution Transformations Standard scores - Z scores Correlation and regression Linear regression Readings and links

 

Chapter 4: Analysing the Data
Part II : Descriptive Statistics

 

Variance

Variance (of a sample) is defined as

Once we divide the Sums of Squares by N-1 we get the sample variance which can be thought of as an averaged sums of squares. While important in statistical theory and in many statistical computations, it has the problem of being in squared units and is therefore difficult to manipulate and visualise.

To get the SS for a variable from the Frequencies information, you need to rearrange the above equation to get

 

 

 

 

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