Number of pairs of observations of X and Y series is 50. Their standard deviations are 4.5 and 3.5 summation of products of corresponding deviations of X and Y series = + 420 calculate correlation co-efficient of X and Y
If rxy is positive the relation between X an Y is of the type:
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?
Mock Test Series
