How do you 1) calculate for r-squared, 2) interpret said r-squared, and 3) if you were to find and interpret this table at 95% confidence interval for the slope? Attachment below:

TABLE 2 Source SS df MS Number of obs 51 F (1, 49) 5.69 Model 306290.429 1 306290.429 Prob > F 0. 0209 Residual 2636337.49 49 53802.806 Total 2942627.92 50 58852.5584 Root MSE 231.95 violent crime Coefficient Std. err. L P>ILI high school grads -21. 64402 9.071385 -2.39 0. 021 conS 2297. 362 785 . 0091 2.93 8.005