Measures of Dispersion
- Created by: PsychoMunchkin
- Created on: 22-04-22 14:59
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- Measures of Dispersion
- Range
- The difference between the highest and lowest scores in a data set
- Calculated by subtracting the lowest score from the highest score then adding 1
- Strengths
- Quick and easy to work out
- Weaknesses
- Does not take into account all scores
- Can be affected by outliers?
- Standard Deviation
- Standard Deviation measures the SPREAD of the data i.e. how spread out our data is from the mean
- High Standard Deviation – The data is very spread out from the mean
- Low Standard Deviation – The data is very close to the mean
- Standard Deviation of 0 – All the data points in the set are the same?
- Variance
- The value we calculated in Step 4 (the mean of squared differences (SD)
- This value also tells us how spread out the data is however we tend to just use Standard Deviation
- Range
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