Descriptive statistics: Measures of Dispersion
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- Created on: 01-06-22 15:47
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- Descriptive
statistics: Measures of Dispersion
- Range
- This is the difference between the highest and lowest numbers.
- STRENGTH
- Uses the highest and lowest numbers and therefore takes into consideration extreme scores.
- WEAKNESS
- Only using two scores in the data set and ignoring the rest therefore it may not be representative of the data set as a whole.
- The extreme scores could distort the range.
- Standard Deviation
- This is a more precise measure of the spread of data as it is not distorted by a single extreme score.
- It takes into account how spread out all of the values are from the mean.
- The greater the standard deviation, the more the data is spread out around the mean. Therefore, the smaller the standard deviation, the more reliable the mean.
- STRENGTH
- SD is the most powerful measure of dispersion as it uses every score in the data set.
- WEAKNESS
- Can only be used with a normal population. May be affected by extreme values.
- Range
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