Effects of Physical Training A study was conducted to investigate effects of physical training. Sample data from ten subjects are listed below, with all weights given in kilograms.

(See “Effect of Endurance Training on Possible Determinants of VO2 During Heavy Exercise,”

by Casaburi et al., Journal of Applied Physiology, Vol. 62, No. 1.)

a. 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?

b. Construct a 95% confidence interval for the mean of the differences between pre-training and post-training weights.

Pre-training: 99 57 62 69 74 77 59 92 70 85 Post-training: 94 57 62 69 66 76 58 88 70 84