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MMLU / A producer of skin care products has created a new formula for its cream to cure…

Problem

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question

A producer of skin care products has created a new formula for its cream to cure acne. To compare the effectiveness of the new cream to that of the old cream, it conducted a double-blind randomized experiment. Volunteers with acne tried the old formula on one side of their face and the new formula on the other, and which side got which formula was determined randomly. The response variable was the difference in the number of pimples (old formula - new formula). Which is the correct significance test to perform?

choices

  1. A two-proportion z-test
  2. A two-sample t-test
  3. A matched pairs t-test
  4. A chi-square test of independence

subject

high_school_statistics

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