An examination was given to two classes consisting of 40 and 50 students, respectively. In the first class the mean grade was 74 with a standard deviation of 8, while in the second class the mean grade was 78 with a standard deviation of 7. Is there a significant difference between the performance of the two classes at the (a) 0.05 and (b) 0.01 levels? a. None of the given answers
b. (a) there is no significant difference between the classes
(b) there is a signifcant difference in performance between the two classes and that the first class is probably better.
c. (a) there is a signifcant difference in performance between the two classes and that the second class is probably better.
(b) there is no significant difference between the classes
d. (a) there is a signifcant difference in performance between the two classes and that the first class is probably better.
(b) there is no significant difference between the classes
e. (a) there is no significant difference between the classes
(b) there is a signifcant difference in performance between the two classes and that the second class is probably better.