Can someone help me answer these sample midterm questions for econometrics? Thank you, and could you please show your calculations as well.

6. In this question, you have the following Stata output. use "WAGE1.DTA" = gen educsq educ^2 reg wage educ educsq exper Source | SS df MS Number of obs 526 F(3,522) 59.12 Model | 1815.84314 Residual | 5344.57115 522 3 605.281048 10.238642 Prob > F R-squared 0.0000 = 0.2536 Total | 7160.41429 525 13.6388844 Adj R-squared Root MSE = 0.2493 3.1998 wage Coef. Std. Err. t P>|t| [95% Conf. Interval] educ educsq| exper _ cons -.3837791 .0436347 .2365292 .0097853 .0656694 2.379455 .0108302 -1.62 0.105 4.46 0.000 6.06 0.000 -.8484451 .0808869 .0244112 .0628582 .0443932 .0869456 1.497154 1.59 0.113 -.5617323 5.320642 (a) (10 points) Based on the regression results, what do you say for the effect of the increase from educ = 16 to educ = 20 on wage holding all the other factors fixed?