Do students perform worse when they take an exam alone than when they take an exam in a classroom setting? eleven students were given two tests of equal difficulty. they took one test in a solitary room and they took the other in a room filled with other students. the results are shown below. alone 82 78 94 70 71 72 87 81 84 65 93 group 86 78 97 69 75 77 90 83 78 72 95 assume the distribution of the differences is normal. what can be concluded at the 0.05 level of significance? (d = score before - score after)