Please kindy do this problem all

2. (20 points) In a regression trying to explain student grades in Intermediate Macro class (grades are represented as a number from 4, which is an A, down to 0 for F), we use grades in 4 prerequisite classes: calculus, Eco 101, Eco 102, and Eco 103. Consider this output: 3 Estimate Std. Error (Intercept) 0.93155 0.23881 GP Calc 0.11545 0.03034 GP.Eco101 0.19374 0.06487 GP.Eco102 0.32428 0.05108 GP. Eco 103 -0.01309 0.05428 a. What is the t-statistic and p-value for each estimated coefficient? b. Discuss which variables are statistically significant. Are there surprises? Explain. What available data might improve the predictive power of this regression