A professor gives an exam for which there are two versions, A and B. Each student in the class is given one randomly selected version of the exam. After the exam, the professor wishes to determine if there is a difference in the level of difficulty of the two versions by determining if there is a significant difference in the mean scores. Assume ? = 0.05.
Version A Version B
Sample size 45 65
Mean score 8.8 8.2
Sample variance 2.6 2.4
What is the test value for this hypothesis test?
Answer=
What is/are the critical value(s) for this hypothesis test? If there are two critical values, give only the positive value.
Answer=