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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Group 1 Group 2 20 25 30 5 10 15 Dataset A Group 1 Group 2 10 15 30 Dataset B 25 20