A nutritionist is interested in whether vitamin C is helpful for curing the comm

Question

A nutritionist is interested in whether vitamin C is helpful for curing the common cold. A total of 60 people are exposed to a common cold virus, and then 20 are randomly assigned to a placebo group, while the other 40 take one of two doses of vitamin C. The nutritionist puts the 20 people not taking a placebo and with more symptoms on a higher dose of vitamin C, and those with fewer symptoms take a lower dose.

What are the explanatory and confounding variables in the study above?

A) Explanatory: exposure to cold virus; confounding: symptoms

B) Explanatory: symptoms; confounding: exposure to cold virus

C) Explanatory: placebo, low dose, high dose; confounding: symptoms

D) Explanatory: symptoms; confounding: placebo, low dose, high dose

E) Explanatory: placebo, low dose, high dose; confounding: exposure to cold virus

F) Explanatory: exposure to cold virus; confounding: placebo, low dose, high dose

Explanation / Answer

Here,

The explanatory variable is the amount of dosage of Vitamin C which the people are taking and the confounding variable is Symptoms.

Hence,

Explanatory: placebo, low dose, high dose; confounding: symptoms

Option C is correct.

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