Measures of central tendency: These try and calculate the average, it used on of these three methods
The Mean: Add up all of the scores and divide by the number of scores. Its not good for nominal data.
The Median: Its the middle value in an ordered list. Its not appropriate for nominal data.
The Mode: Its the value which is most common in the data. It is appropriate for nominal data, or data in categories.
Measures of dispersion: Trys to tell us about the spread of the data
The Range: Calculated by finding the difference between the highest and lowest score but might be effected by extreme values.
Standard Deviation: Expresses the spread of data around the mean, all bits of data are examined.
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