9.41 A measurement of physiological activity important to runners is the rate of oxygen consumption.

Research Quarterly, May 1979, reports on the differences between oxygen consumption rates for college males trained by two different methods, one involving continuous training for a period of time each day and the other involving intermittent training of about the same overall duration. The sample sizes, means, and standard deviations are as follows (measurements in ml/kg • min):

If the measurements are assumed to come from normally distributed populations, estimate the difference between the population means with a confidence coefficient 0.95. Also find a 90% confidence interval for the ratio of the true variances for the two training methods. Does it appear that intermittent training gives more variable results?

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Continuous Training n = 9 Intermittent Training Y = 43.71 S = 5.88 n = 7 J = 39.63 S = 7.68