Consider the following regression output where the dependent variable is test scores and the two explanatory variables are the student-teacher ratio and the percent of english learners: modifyingabove test score with caret equals 698.9 minus 1.10 times str minus 0.650 times pctel. you are told that the t-statistic on the student-teacher ratio coefficient is 2.56. the standard error therefore is approximately: a.0.650.b.1.96.c.0.25.d.0.43.