What is the predicted value oftestscr when str, Ivrvginc= e1_pc1: and comp_sm equal to their sample averages? Round your answer to 1 decimal place. QUESTION 13 | Spoims What is the estimated change on test scores when percentage of English learners increases by 5 and computers per student decreases by 0.05? Round your answerto 2 decnnal places. QUESTION 19 | Spoinls What is the estimated change on test scores when average income increases by 1 standard deviation? Round your answer to 2 decimal places. QUESTION 20 | Spoinls Suppose that we are interested in testing the claim that the mean of average income is larger than I, calculate the test statistic for testing this claim. Round your answer to 2 decixual places. \f|i'alUESTICM'I 11 Following 4 Questions are based on the following Stata out put: (Please keep at least 4 digits aecr decimal places when you do the calculation, so that your final answer is accurate.) . Slll'l'l Variable observatio~r testscr comp_stu str avginc el_pct Obs 388 388 388 388 388 388 388 Mean 281.6833 653.3492 .1334225 19.12156 15.13816 16.54281 -.4524539 Std. Dev. 122.3813 19.86331 .8621321 1.859389 1.832588 19.11315 .112643 -2.626153 Max 428 186.15 .3435898 25.8 55.328 85.53912 .5695456 Source Model Residual Total testscr str avginc el_pct comp_stu _cons . reg testscr str avginc el_pct comp_stu SS df MS 78487.9378 4 19621.9845 38171.5424 295 182.276415 188659.48 299 363.489633 Coef. Std. Err. t .2863885 .3379955 8.61 1.483112 .8988811 18.48 -.4743759 .8328134 -14.46 21.38236 18.88375 2.12 631.821 7.588832 84.24 P>|t| 8.542 8.888 8.888 8.835 8.888 Number of obs Fl 4, 295} Prob > F Rsquared Adj Rsquared Root MSE [95% Conf. .4587995 1.385987 -.538954 1.53716 617.8687 388 191.85 8.8888 8.7223 8.7186 18.113 Interval] .8715765 1.668238 -.4897978 41.22756 646.5814