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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