Advantage of Multiple Regression

Partial Correlation

Which method is used in correlational research to rule out alternative explanations by measuring extraneous variables and incorporating them into the data analysis?

A researcher observes a positive correlation between the number of hours students spend exercising per week and their self-reported happiness scores. Suspecting that 'quality of sleep' might explain this relationship, she measures average nightly sleep hours for each participant and includes it as an additional variable in a multiple regression analysis alongside exercise and happiness. By doing this, the researcher is using statistical control to rule out sleep quality as an alternative explanation for the exercise–happiness correlation.

A researcher finds a correlation between students' time spent on social media and their reported levels of anxiety. Suspecting that 'quality of sleep' might be a third variable explaining this link, the researcher decides to use statistical control. Arrange the steps of this analytical process in the correct logical order.

You are designing a research protocol to examine the relationship between 'screen time' (Variable $X$) and 'attention span' (Variable $Y$). You suspect that both 'age' (Variable $Z_{1}$) and 'education level' (Variable $Z_{2}$) are potential third variables. Which of the following research plans correctly constructs a system of statistical control to address these extraneous variables?

To implement statistical control in a correlational study, researchers must physically hold potential third variables constant during the data collection process.

A researcher finds a correlation between mindfulness practice and job satisfaction. To evaluate whether daily stress levels act as a confounding variable, she measures stress and uses statistical control to account for it. When evaluating the validity of any causal claim built on this approach, one must recognize that statistical control is limited because it cannot account for _____ third variables.

A researcher studying the link between social media use and loneliness suspects that age may be a third variable driving the relationship. Match each strategy for addressing this concern with its correct description.

Instead of controlling potential third variables through physical isolation or random assignment, researchers using statistical control must _____ these extraneous variables during data collection to mathematically account for them in their statistical analysis.