The following data are the scores of two groups of students of the same class in statistics. Assume that both sets of scores are from populations that follow normal distributions with equal variance. Test the hypothesis that the means are the same. Use the level of significance α=0.05. 

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A B A B 63 55 66 43 68 47 61 93 64 44 63 60 57 77 69 66 60 70 65 48 64 52 72 51 69 64 70 56 56 63 58 63 65 61 55 67 59 74 68 70