Answered: Q17. A medical study found a negative…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Q17. A medical study found a negative relationship between exercise [in minutes per week] and stress-related health problems [r = -.26]. Answer the questions below. \textit{Hint}Hint: See Q16.

17a. Which of the following conclusions is appropriate?

a. Of the variance in stress-related health problems, 6.76% can be explained by the amount of weekly exercise.

b. Increasing the amount of exercise per week will cause stress-related health problems to decrease.

17b. Explain why the other is not appropriate.

a. The correlation is negative, so we can conclude that it is the exercise that is causing the reduction in stress-related health problems, and not that a reduction in stress-related health problems will increase exercise.

b. That variations in exercise account for 6.76% of the variance in stress-related health problems is cause for celebration.

c. Correlations do not demonstrate causation

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