Solved: The authors of the paper Objective Effects of a SixMonths Endurance and Strength

Chapter 12, Problem 61

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The authors of the paper Objective Effects of a SixMonths Endurance and Strength Training Program inOutpatients with Congestive Heart Failure (Medicine andScience in Sports and Exercise, 1999: 11021107) presenteda correlation analysis to investigate the relationshipbetween maximal lactate level x and muscular endurance y.The accompanying data was read from a plot in the paper.a. Test to see whether there is a positive correlation betweenmaximal lactate level and muscular endurance inthe population from which this data was selected.b. If a regression analysis were to be carried out to predictendurance from lactate level, what proportion of observedvariation in endurance could be attributed to theapproximate linear relationship? Answer the analogousquestion if regression is used to predict lactate level fromenduranceand answer both questions without doingany regression calculations.