The article "Multimodal Versus Unimodal Instruction in a Complex Learning Environment" (J. of Experimental Educ., 2002: 215-239) described an experiment carried out to compare students' mastery of certain software learned in two different ways. The first learning method (multimodal instruction) involved the use of a visual manual. The second technique (unimodal instruction) employed a textual manual. Here are exam scores for the two groups at the end of the experiment (assignment to the groups was random):

Does the data suggest that the true average score depends on which learning method is used?

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Method 1 44.85 46.59 47.60 51.08 52.20 56.87 57.03 57.07 60.35 60.82 67.30 70.15 70.77 75.21 5.28 76.60 80.30 81.23 Method 2: 51.95 56.54 57.40 57.60 61.16 39.942.01 43.58 48.83 49.07 49.4849.57 49.63 50.75 64.55 65.3 68.59 72.40