In a simple linear regression, the regression equation is given by Y_e = a + bX.

Question

In a simple linear regression, the regression equation is given by Y_e = a + bX. The correlation coefficient (r) and the least squares estimate of b ____. must have the same sign must have the opposite sign may have the opposite sign When the values of (X, Y) are given, before estimating the values of the parameters of the linear equation Y = a + bX, as a first step, you must do the following. Plot the values of X and Y to see if they fat around a straight line and exhibit a linear relationship Calculate the sum (X, Y) for all parts of (X, Y) Calculate the product (X*Y) for all pairs of (X, Y) Calculate the variance of X and variance of Y.

Explanation / Answer

3) Must have same sign

4) Plot the values of X & Y and see if they fall around the straight line and exhibit a linear relationship.

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