An observational study found that the amount of sleep an employee gets each night is associated with job performance. The correlation coefficient was found to be r = 0.86. A reader of the study concluded that more sleep causes employees to perform better. Why is such a conclusion not correct? (A) The correlation value should equal 1 for such a conclusion. (B) The correlation value should be negative for such a conclusion. (C) The sample was not representative of the population. (D) Causation cannot be determined from an observational study. (E) The correlation value implies that less than 75% of the variability in job performance can be explained by sleep.
An observational study found that the amount of sleep an employee gets each night is associated with job performance. The correlation coefficient was found to be r = 0.86. A reader of the study concluded that more sleep causes employees to perform better. Why is such a conclusion not correct? (A) The correlation value should equal 1 for such a conclusion. (B) The correlation value should be negative for such a conclusion. (C) The sample was not representative of the population. (D) Causation cannot be determined from an observational study. (E) The correlation value implies that less than 75% of the variability in job performance can be explained by sleep.
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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