A secretarial training school is experimenting with four different manuals for a typing course. The school divided 20 students into four classes, and each class used a different manual. At the end of the training session, a test was given, and the scores shown in the table were reported. Do the data support the hypothesis that the four different manuals create different effects? Do a 5 % test.

Manual

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A 93 85 85 79 86 D 89 86 87 87 73