(18.29) An anthropologist claims that color blindness is less common in societie
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Question
(18.29) An anthropologist claims that color blindness is less common in societies that live by hunting and gathering than in settled agricultural societies. He tests a number of adults in two populations in Africa, one of each type. The proportion of color-blind people is significantly lower (P < 0.05) in the hunter-gatherer population. What additional information would you want to help you decide whether you believe the anthropologist's claim?
Whether the distributions of the two populations are exactly Normal.
Whether the chosen adults are SRS's from the two populations.
Whether there are outliers in the samples.
Whether the two populations have similar spreads.
What where the sample sizes.
Explanation / Answer
The correct option is:
What were the sample sizes.
This is because two proportion z test is valid for large sample sizes only.
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