(a) What value of R 2 is required so that a regression with five independent variables is significant if there are 30 observations? (b) Answer part (a) if there are 500 observations. (c) What do these...

(a) What value of R²
is required so that a regression with five independent variables is significant if there are 30 observations?

(b) Answer part (a) if there are 500 observations.

(c) What do these results tell us about the R²
statistic?

(True/False) The t statistic for an individual coefficient measures the contribution of the corresponding independent variable, after controlling for the other variables in the model.