Sampling and Experimentation — Test

Question 20 • Statistics and Probability

Which method describes an experiment?

Answer

Method B is an experiment because every car receives the additive.

Method A is an experiment because the additive is used with a new tank of gasoline.

Method A is an experiment because random assignment determines which cars receive the additive and which cars do not.

Both methods are experiments because the additive is used in a new tank of gas in both methods.

Explanation

An experiment deliberately applies a treatment and compares its effects with a control group. Method A uses random assignment to determine which cars receive the additive and which do not, allowing a fair comparison. Simply using a new tank of gasoline does not make a method an experiment, and giving the additive to every car provides no untreated control group.

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