Question

2 multiple choice 2 points which of the following would be a control in an experiment testing the prediction that a certain drug prevents cataracts in females over the age of 65? male subjects female subjects younger than 65 alternative drugs that are suspected to prevent cataracts female subjects over 65 that are given placebos male subjects over 65 previous

Explanation:

In an experiment testing if a drug prevents cataracts in females over 65, the control group should be as similar as possible to the experimental group except for the variable being tested (the drug). Female subjects over 65 given placebos are in the same age - and gender - group as the experimental group but not receiving the actual drug, allowing for a proper comparison to see if the drug has an effect.

Answer:

D. female subjects over 65 that are given placebos