Maybe even more important than how much they weigh is that the plates used in weightlifting be
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When one of each weight is hanging on opposite ends of a bar, they need to balance. A random sample of twenty-four 25-lb weights used for weightlifting were randomly selected and their weights (in pounds) determined:
There have been complaints about the excessive variability in the weights of these 25-lb plates. Does the sample show sufficient evidence to conclude that the variability in the weights is greater than the acceptable 1-lb standard deviation? Use a = 0.01
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25.3 22 25.7 24.2 25.7 23.9 23. 21.9 24.7 26.3 26.5 22.2 25.9 23.5 25.8 27.1 25.4 22.0 25.2 21 27.9 22.9 27.3 25.7
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