(i) What are the limits of r?
(ii) If r = +1 or r = –1, what kind of relation exists between X and Y?
(i) r is always between –1 and +1 that is –1 ≤ r ≤ 1
(ii) If r = +1 or r=–l it means that there is perfect relation between the variables. In other ways the relation between two variables is exact.
If rxy = 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.
Mock Test Series
