Can someone explain and help me answer A-D?

4. You run a series of bivariate analyses to determine which variables explain how people felt about President Trump. The three you focus most on are spending time with family, year in school, and party identification (recoding this to be a dummy variable for Republican (0) versus Democrat (1)). All three of these are statistically significant in the predicted directions in these bivariate analyses. However, you are unconvinced and decide to run a regression analysis. When you run the regression analysis, you get the following results: regress Feeldt Stfa Yrschool PartyRD Source SS MS Number of obs 345 F (3, 341) 155 .80 Model 230444 . 02 3 76814. 6733 Prob > F 0 . 0000 Residual 168126. 49 341 493 . 039561 R-squared 0 . 5782 Adj R-squared 0 . 5745 Total | 398570 . 51 344 1158 . 6352 Root MSE 22. 204 Feeld Coef Std. Err. P> It/ 1958 Conf. out . Interval] Stfa 0381473 . 0403004 0 . 95 0. 345 -. 0411212 1174159 YrSchool -1. 685959 9936335 -1 . 70 0 . 091 -3. 640381 PartyRD -58 . 99462 2. 807426 . 2684638 -21 . 01 0. 000 -64 . 51667 -53. 47257 cons 78 . 61913 2. 921743 26 . 91 0 . 000 72. 87222 84 . 36604 a. List the variables that are statistically significant at 90% confidence. b. Interpret the constant in words. c. Interpret the effects of strength of year in school in words. d. Interpret the effects of party in words