The mean grade on a test of 60 students was x-bar= 52. The nationwide average was 50 with standard deviation 15. Test whether the school has a significantly GREATER average than the national average at the 5% significance level? | What is the Table A2 CRITICAL VALUE for the problem? Note Answer Input Format for Critical Values. ______________________________ Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 1.645 is entered as 1.65, -2.326 is entered as -2.33, 2.054 is entered as 2.05, -1.282 is entered as -1.28