Answer questions

Section 3
The coefficient of attendance is 0.017. It's not Statistically significant because it has low value with standard error of 0.034, which is much higher than coefficient. If we calculate
t stat = coefficient/std.error
= 0.017/0.034 = 0.50.
t stat= 0.50. Which is a lower value, that means we are near to null hypothesis.
B. No, there is no evidence of increasing marginal returns. In the previous model we have coefficient and std.error values are 3.23 and 0.34 respectively t stat will be close to 10. In the second model we have controlled the...