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# Coding - Statistics Maths Edexcel Watch

1. How would do you data is coded? Would it say on the questions?

Thankyou!
2. (Original post by Rukia12)
How would do you data is coded? Would it say on the questions?

Thankyou!
Yes it would say how,the data had been coded.

One possible exception might be if the question said there had been a mistake in how a variable had been measured or recorded and e.g. All values were 10 too large.. You could use coding principles to work out the affect on mean, standard deviation, correlation etc without recalculating the data.

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3. Aren't there rules about the effect on mean etc??
4. (Original post by Rukia12)
Aren't there rules about the effect on mean etc??
E(a + bX) = a + bE(X)
Var(a + bX) = b^2Var(X)

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