The sales of a departmental store on Dushera and Diwali are associated with the component of a time series

Given r ₁₂ =0.6, r ₁₃ =0.5 and r ₂₃=0.8, the value of r _12.3 is

Given the regression lines X+2Y-5=0, 2X+3Y-8=0 and Var(X)=12, the value of Var(Y) is

A measure of linear association of a variable with a number of other variables is known as

The hypothesis for a specific known value of _p can be tested by

The range of simple correlation coefficient is