Practice · Praxis

Multiple choice Hard confidence-intervalconceptual ~100s

A poll reports 52% support with a margin of error of ±3 percentage points at 95% confidence. What does this mean?

A 95% of people surveyed said something between 49% and 55% B There is a 95% probability the true support is between 49% and 55% C The procedure produces an interval containing the true value 95% of the time; this particular interval is 49–55% D If the poll were repeated, 95% of the time it would report exactly 52%

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