Find the area of the composite figure
1 answer:
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Answer:
At least 585 people aged 65 and older is needed to be surveyed for the 90% confidence level and 3% margin of error.
Step-by-step explanation:
The following formula can be used to compute the minimum sample size required to estimate the population proportion within the required margin of error:
n≥ p×(1-p) × where
- n is the sample size
- p is the proportion of people aged 65 and older have earned a bachelor's degree or higher (26.7% or 0.267)
- z is the corresponding z-score for 90% confidence level (1.64)
- ME is the expected margin of error in the estimation (0.03)
then n≥ 0.267×0.733 × ≈584.87
Then n should be at least 585