After an improvement program, the score on a test of 80 students changed to a mean 76 from a historical average of 74. The historical known standard deviation was 8. Can it be concluded that the improvement program CHANGED in any way the test score? Use a 5% significance level. | What is the value of the TEST STATISTIC? ______________________________ Note: Enter XXX.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 134.784 is entered as 134.78, 35.295 is entered as 35.30, .2749 is entered as 0.27, -.5650 is entered as -0.57