60 illiterate preschool children were randomly divided into four groups of 15 children. Each group used a different method to teach reading skills. Afterwards, reading skills were tested with the following results. Group X ̄i group Xi S2i 1 65 224 2 62 241 3 68 233 4 61 245 Test the null hypothesis that the methods are equally effective. Use a five percent significance level.   Functions from excel or R should not be used to test this.

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