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Considering the small sample, we need to know the origins of the balls collected? For example, if one of the pre-2H2015 balls was a single, while the post-2H2015 balls was a HR, it could bias the results. If that’s the case, this would still suggest that the ball composition has an effect on HRs, but it would not suggest the balls being used now are different from the recent past. Along those lines, it would be interesting to see the measurements of currently usedballs based on outcome.

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