How to Experiment Well — Quiz

Question 7 • Statistics

Which statement best describes the composition of the groups?

Answer

The characteristics of the two groups might not be roughly equivalent because students who arrive around the same time might be friends and have similar preferences for scented candles.

The characteristics of the two groups might not be roughly equivalent because the students were not labeled and given a random number to place them in one of the groups.

The characteristics of the two groups should be roughly equivalent because the students were split into groups on a randomly chosen day.

The characteristics of the two groups should be roughly equivalent because both groups have 15 students.

Explanation

Students were divided based on when they arrived, rather than being randomly assigned. Students arriving around the same time could be friends or share preferences, including preferences for scented candles, so the groups might differ in relevant characteristics. Having 15 students in each group does not guarantee that the groups are equivalent.

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