Refer to the following regression results. The dependent variable is Abort (the number of abortions per 1000 women of childbearing age). The regression was estimated using data for the 50 U.S. states with these predictors: EdSpend = public K-12 school expenditure per capita, Age = median age of population, Unmar = percent of total births by unmarried women, Infmor = %3D %3D %3D infant mortality rate in deaths per 1000 live births. Coefficients Standard Error -19.244 Variable t-Stat 25.387 -0.758 Intercept EdSpend Age Unmar 0.0080040 0.0054472 1.469 0.76012 0.66914 1.136 0.98629 0.22132 4.456 InfMor -3.7848 1.0173 -3.720 19. In a two-tailed test for significance, at a level of significance of .01, the critical value to test Unmar is plus/minus Select one: O 2.690 O 2.412 O 2.692 O 2.414

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