Experiment 1: A study is done to determine which of two fuel mixtures allows a rocket to travel farther over a period of time.

Question

Experiment 1: A study is done to determine which of two fuel mixtures allows a rocket to travel farther over a period of time.
Rocket A, which requires additional equipment to keep it stable, is used to test one fuel mixture, and rocket B is used to test
the other. Both rockets are identical aside from their mass. The results indicate that rocket B traveled farther than rocket A over
the same period of time.
Experiment 2: A double-blind experiment is performed to test whether a new drug is effective in lowering blood pressure. A
random sample of subjects with high blood pressure is assigned to two groups. One group receives the new drug and the other
group does not. Neither group is permitted to take any other medications during the experiment or to change their lifestyles in
any way. The results of the experiment show that the drug is effective in lowering blood pressure.
Identify the experiment in which confounding occurs and the reason for its occurrence.
Experiment 1 has a confounding variable related to the fuel mixtures. Varying the fuel mixture could skew the results
of the study and should be kept constant.
Neither experiment has a confounding variable.
Experiment 2 has a confounding variable related to the type of experiment. A double-blind experiment may increase
the risk of the placebo effect and possibly skew the results.

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