The president of an all-female school wants to know if the students at her school studied more or less, on average, than the students at a neighboring all-male school. To find out, she conducted a study. Accordingly, samples were taken at each school with the following results: School Sample Size Mean Study Time (hrs) Standard deviation (n) (M) (hrs) (S) All Female 43 18.56 4.35 All Male 38 17.95 4.87 Using a = .05, select the correct critical value O CV not listed in the table 1.992 1.990 O 1.665