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GCSE Statistics · key term
An original data value before it has been converted or adjusted.
Used by Edexcel
Specification 2c.06 · Paper 1, Paper 2
Revise: Standardising comparative dataFirst, subtract the mean to find how far the raw value lies above or below it. Then divide by the standard deviation to express that distance in standard-deviation units. A difference of 10 marks is two standard deviations when the standard deviation is 5 marks, but only one standard deviation when it is 10 marks.
Use the mean and standard deviation of the sample that each raw value belongs to.
Compare the standardised scores, then explain what the comparison means in context. A higher standardised score is better only when a higher raw value is desirable.
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