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Correlation

Question

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Calculate the correlation co-efficient between X and Y and comment on their relationship.

X

–3

–2

–1

1

2

3

Y

9

4

1

1

4

9

Solution

Hence, r = 0

Two values X and Y are un-corrected.

There is no linear correlation between them.

Some More Questions From Correlation Chapter

If r_xy = 0 the variable X and Y are:

Of the following three measures which can measure any type of relationship:

If precisely measured data are available the simple correlation coefficient is:

Why is r preferrred to co-variance as a measure of association?

Can r lie outside -1 and 1 range depending on the type of data?

Does correlation imply causation?

When is rank correlation more precise than simple correlation coefficient?

Does zero correlation mean independenc?

Can simple correlation coefficient measure any type of relationship?

Collect the price of five vegetables from your local market everyday for a week. Calculate their correlation coefficient. Interpret the result.

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