If r_xy = 0 the variable X and Y are:

 

•  Linearly related

• Not linearly related

• Independent

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

• Karl Pearson’s coefficient of correlation

• Spearman’s rank correlation

• Scatter diagram

The range of simple correlation coefficient is:

• 0 to infinity

• Minus one to plus one

•  Minus infinity to infinity

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

• When Y increases X increases

• When Y decreases X increases

•  When Y increases X does not change

The unit of correlation coefficient between height in feet and weight in kgs is:

• kg/feet

• percentage

• non-existent