Two sets of sample data, A and B, are given. Without doing any calculations, indicate in which set of sample data, A or B, there is likely to be stronger evidence of a difference in the two population means. Give a brief reason, comparing means and variability, for your answer.

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Dataset B Dataset A Group 1 Group 2 Group 1 Group 2 12 25 15 20 20 18 14 21 15 16 19 21 28 15 19 14 14 15 21 X1 = 15 x2 = 20 x1 = 15 x2 = 20