answer all questions with explanation

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.Eco103 -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