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Quantitative and Statistical Evidence
Grade Level
GRE
GRE.66 Quantitative and Statistical Evidence
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Two polls address the same national issue. A probability-based sample of 1,500 adults reports 52% support; an open online poll with 80,000 participants reports 68%. Which use of the polls is strongest?
A
Give greater evidentiary weight to the probability-based poll because its sampling method is designed to represent the population, while using the online result only as evidence about self-selected participants.
B
Treat both percentages as exact measurements of the national population.
C
Prefer the online poll solely because 80,000 is a larger number than 1,500.
D
Average 52% and 68% without considering how either sample was obtained.
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