The equation for a regression line predicting the number of hours of TV watched by children (Y) from the number of hours of TV watched by their parents (X) is Y' = 4 + 1.2X. The sample size is 12. (a)...

The equation for a regression line predicting the number of hours of TV watched by children (Y) from the number of hours of TV watched by their parents (X) is Y' = 4 + 1.2X. The sample size is 12.
(a) If the standard error of b is .4, is the slope statistically significant at the .05 level?
(b) If the mean of X is 8, what is the mean of Y?