summarising data
- Created by: eleanor
- Created on: 11-04-15 12:48
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- Summarising Data
- Linear Interpolation
- Finding the median
- Formula:
- extend groups to show they are continuous
- Find cumulative frequency
- Finding the median
- Mean and Standard Deviation
- Mean
- Is influenced by extreame values
- used for symmetrical data or grouped data
- Grouped Data
- sum of (frequency x midpoint) / over total frequency
- For a list
- Standard Deviation
- is a measure of dispersion or spread from the mean
- Formula:
- square the data then add them all up
- The mean of x squared
- grouped data:
- square the x values then multiply by the frequencies then add them up
- You then need to square root the answer to find the standard deviation
- Mean
- Coding
- you mght be told that the dat is coded this is to make the numbers easier to work with
- to find the mean of the original data quate the coded mean to the coding formaula and solve
- to find the standard deviation of the original data ignore the addition and subtractions and equate
- Linear Interpolation
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