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MMLU / A doctor hopes that a new surgery technique will shorten the recovery time…

Problem

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question

A doctor hopes that a new surgery technique will shorten the recovery time compared to the standard technique. To test this, he designed an experiment in which patients who required this type of surgery were randomly assigned to the standard technique or the new technique. Then the mean recovery time for each treatment group was compared. Assuming conditions for inference were met, which analysis should be used?

choices

  1. A t-test for a mean.
  2. A t-test for a difference in means.
  3. A z-test for a mean.
  4. A z-test for a difference in means.

subject

high_school_statistics

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Source and history

Official source

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