Math Problem Statement
Find the margin of error and 95% confidence interval for the survey result described. Surveying 1655 adults, a research center reported that "an overwhelming majority of Americans (76%) support requiring all healthy schoolchildren to be vaccinated for measles, mumps and rubella." Question content area bottom Part 1 Margin of errorequals enter your response here% (Type an integer or decimal rounded to one decimal place as needed.)
Solution
To find the margin of error (MOE) for the survey result, we can use the following formula for the margin of error at a 95% confidence level:
where:
- is the Z-score corresponding to the desired confidence level (for 95%, )
- is the sample proportion (76%, or 0.76)
- is the sample size (1655)
Step-by-Step Solution:
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Convert 76% to a decimal:
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Compute :
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Divide by the sample size :
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Take the square root:
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Multiply by the Z-score for a 95% confidence level (1.96):
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**Convert
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Math Problem Analysis
Mathematical Concepts
Statistics
Confidence Intervals
Margin of Error
Z-scores
Formulas
Margin of Error (MOE) = Z × sqrt(p(1 - p) / n)
Theorems
Central Limit Theorem
Normal Distribution for Confidence Intervals
Suitable Grade Level
Grades 11-12
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