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A Field Poll finds that 400 out of 506 surveyed California adults, about 79%, feel education is a top issue. What is the point estimate for the true population proportion?
A0.90
B0.79
C400
D1.27
Answer & Solution
Correct answer: B. 0.79
1. The point estimate for a population proportion is the sample proportion p' = x/n.
2. Here x = 400 and n = 506, so p' = 400/506 ≈ 0.79.
3. So the point estimate for the true proportion is 0.79.
4. Option C confuses the raw success count with the proportion itself, and option B reuses the target confidence level instead.
_Source: OpenStax Introductory Statistics (CC BY 4.0), Ch 8 "Confidence Intervals", section 8.3 A Population Proportion_
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