We conducted [ Select ] ["a paired", "a matched", "an independent", "a single"] -sample(s) t-test to compare the average math scores of classrooms that received the new curriculum (m = 25, SD = 11, n = [ Select ] [120", "20", "100"] ) to the average scores of classrooms that received the standard curriculum (m = 20, SD = 13. [ Select ] ["20", "120", "100"] ). The mean difference between both groups was [ Select ] ["0". "3", "8", "5"] points, and the pooled standard deviation was [ Select ] [12.80", "11.50", "12.70", "11.35"] points. The t-statistic was [ Select ] [1.607", "1.548", "1.799", "1.964"] , degrees of freedom = [ Select ] [119". "120", "117", "118"] . p= [ Select ] [.111", ".075", ".037", ".055"] . Hence based on this analysis, there was [ Select ] [insufficient", "sufficient"] statistical evidence to claim that the new curriculum was effective at improving math performance across classrooms