Dr. Skool conducts a study and finds that children's grades in elementary school are positively correlated with their time spent doing homework. Which of the following illustrates an example of the third-variable problem, which may interfere with your interpretation of these results? A) The study design did not allow for random assignment, so we can't determine whether results reflect patterns in the general population B) Time spent doing homework might be correlated with availability of supportive caregivers. We don't know whether it is the homework or the caregiving that leads to better grades. C) It might be that children who have better grades spend more time doing homework. We can't tell the direction of effects based on this study design. D) B& C
Dr. Skool conducts a study and finds that children's grades in elementary school are positively correlated with their time spent doing homework. Which of the following illustrates an example of the third-variable problem, which may interfere with your interpretation of these results?
A) The study design did not allow for random assignment, so we can't determine whether results reflect patterns in the general population
B) Time spent doing homework might be correlated with availability of supportive caregivers. We don't know whether it is the homework or the caregiving that leads to better grades.
C) It might be that children who have better grades spend more time doing homework. We can't tell the direction of effects based on this study design.
D) B& C
There's a positive correlation between grades scored in exams and the time spent on homework in children of elementary school.
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