Healthy volunteers were recruited, and their vacation preferences were scored us

Question

Healthy volunteers were recruited, and their vacation preferences were scored using a questionnaire (they were asked to answer yes or no to questions like: "I prefer the beach to the mountains"). The volunteers were then presented with images of places while activity in a certain region of the brain is measured using functional MRI. Preference of volunteers was found to correlate with brain activity in response to the images. Would this study be considered experimental or observational? is the explanatory variable, whereas ris the response variable Rats were used to investigate the effects of Rogaine (a vasodilator) on hair growth. Rats bred for baldness were randomly divided into groups that were treated with different doses of Rogaine, applied to their back once daily. They also had a control group for which vaseline was applied to their back once daily. They found that higher doses of Rogaine led to hair growth. Would this study be considered experimental or observational? v is the explanatory variable, whereas is the response variable

Explanation / Answer

Answer - 1: This would be an observational study because researcher is not trying to influenece any independent variable to measure the value of dependent variable.

Hence, the responses in the blanks in order will be:

Observational; Preferences of Volunteers; Brain activity score

Answer - 2: This would be an experiment because researcher is controlling the dosage of Rogaine to measure its effect on hair growth. Hence,

The responses in the blanks in order will be:

Experiment; Doses of Rogaine; Hair growth

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