PRC-2 · Chapter 12 · Question 12 of 55
If a hypothesis test aims to discover solely if a new medicine works *better* than an old one (focusing strictly on improvement), what type of test is being executed?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) A one-tail test
Explanation
Because the researcher is exclusively testing for an effect in one specific directional tail of the distribution (improvement, not just any difference), it is strictly a one-tail test.
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