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# S1 Product moment correlation coefficient guestimation watch

1. Hello there,
I have a question, is there a proper way of approximating or rather guessing the PMCC of a set of data points without doing any calculations.
For example question 3 on this paper linked below
http://store.aqa.org.uk/qual/gceasa/...W-QP-JAN07.PDF

thank you
2. (Original post by jarasta)
Hello there,
I have a question, is there a proper way of approximating or rather guessing the PMCC of a set of data points without doing any calculations.
For example question 3 on this paper linked below
http://store.aqa.org.uk/qual/gceasa/...W-QP-JAN07.PDF

thank you
It's a guess.

How well does the data approximate to a straight line?

If it's totally random, then the correlation will be 0, or a small value.

If the lines goes up, the approximation will be positive, and if it slants down, then negative.

Some of the diagrams at the top here may be useful.
3. (Original post by ghostwalker)
It's a guess.

How well does the data approximate to a straight line?

If it's totally random, then the correlation will be 0, or a small value.

If the lines goes up, the approximation will be positive, and if it slants down, then negative.

Some of the diagrams at the top here may be useful.
thank you ghostwalker
4. (Original post by jarasta)
...
You're welcome.
5. if postive gradients its a postively correlated, and if weird shapes like circles no correlation,if native gradient then negativley correlated.Simpla as that.

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