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Correlation

Question

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What kind of relation between X and Y is indicated of the points of scatter diagram tend to cluster?
(a) A st. line parallel to the X axis

(b) A st. line parallel to the Y axis

(c) A st. line stepping upwards.

(d) A st. line stepping downwords.

Solution

(a) No relationship between two variables.

(b) No relationship between two variables.

(c) Perfect Positive correlation ( r = +1)

(d) Perfect Negative correlation ( r = –1)

Some More Questions From Correlation Chapter

The range of simple correlation coefficient is:

If r_xy is positive the relation between X an Y is of the type:

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?

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