Q3.Formula for calculating correlation from the assumed mean method is
Answer : Option BExplaination / Solution:
This is the correct formula to calculate Karl Pearson's correlation coefficient. It will take a value ranging from -1 to +1. Positive values of correlation coefficient indicate positive relationship between the two variables, while negative values are indicative of a negative relationship.
Q8.Correlation coefficient is independent of change of
Answer : Option DExplaination / Solution:
By change of scale we mean that all values of X and y series are multiplied or divided by some constant.by change of origin we mean that a constant is subtracted from all values of x and y series if the scale and origin of X and y series are changed the value of r remain unchanged