A study was conducted to investigate effects of physical training. Sample data from ten subjects are listed below, with all weights given in kilograms. Is there sufficient evidence to conclude that there is a difference between the pre-training and post-training weights? What do you conclude about the effect of training on weight?   Pre-training 99 57 62 69 74 77 59 92 70 85 Post-training 94 57 62 69 66 76 58 88 70 84

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