What are the explanatory variables

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Question: A study involving 84 middle-school students investigates the link between a diet high in proces foods and rates of depression. Researchers collecte allected the urine of the participants and measured levels of sodium and potassium. A diet high in processed food, such as fast food, is high in sodium and low in potassium. The students were also evaluated on a 100-point scale for depressive symptoms. The study found that high levels of sodium and low levels of potassium were both associated with higher depression levels.

A. What are the cases in this study?

B. How many rows and how many columns will the dataset have, if we use cases as rows and variables as columns?

C. What are the explanatory variables? Are they categorical or quantitative?

D. Is this an observational study or an experiment?

E. Can we conclude that eating a diet high in sodium and low in potassium increases the likelihood of having depression? Why or why not? Give a possible confounding variable in this study, and explain how it meets the definition of a confounding variable.

Reference no: EM133368827

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