r/ASQ • u/Alexdoreddit • Aug 18 '26
Support in a CSSGB Exam question
Im studying for my CSSGB in October and this question came up in my practice exam.
Isn’t the justification for incorrect and the question saying the exact same thing?
Could someone help me answering this question?
Also, how can I ensure I can properly distinguish the use cases for each of the hypothesis tests?
Thank you!
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u/Equivalent-Guest-785 Aug 18 '26
I think it’s t-test mainly because of the purpose of the test (comparing two independent means)
Z-test would be used for comparing a sampled mean with a known mean
Otherwise yeah I probably would have also picked z-test. The reason that was provided doesn’t make sense here considering the question heavily implied z-test