Using the formula s/s j (n 1)(1 R2j ) for the standard error of the estimator of j in multiple regression, explain

Using the formula s/s j



(n − 1)(1 − R2j

) for the standard error of the estimator of βj in multiple regression, explain how precision of estimation is affected by

(a) Multicollinearity.

(b) The conditional variability of the response variable.

(c) The variability of the explanatory variables.

(d) The sample size.