In an experiment on the visual clarity of a color monitor screen, the effect was examined of various monitor configurations on 84 subjects. The subjects were randomly assigned into four groups of 21 each. The processing used is as follows (screen configuration). T1: white characters on a black background T2: black characters on a white background T3: white characters on blue background T4: yellow characters on black background Each subject can adjust the character and intensity of the screen background to ensure vision comfortable as during a normal work session. The data in the table correspond to the results obtained for the visual acuity of the screen page viewed. The higher the score, the better the visual acuity. Can we consider, at the 5% significance level, that the mean score for visual acuity is identical, regardless of the monitor configuration?

A B C D E 1 Question 4 2 3 Treatments 4 T1 T2 T3 T4 78 88 87 69 85 84 77 99 74 96 81 86 8 97 89 89 90 9 88 74 88 93 10 77 87 91 100 11 81 95 72 100 12 89 77 78 78 13 94 75 88 80 14 88 83 95 82 15 82 82 69 90 16 89 94 89 89 17 83 74 88 87 18 79 82 71 90 19 77 76 97 90 20 93 80 94 88 21 70 85 90 94 22 81 93 91 92 23 70 85 90 94 24 95 83 91 90 25 73 82 90 88 26 27