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:

MOE=Z×p(1p)n\text{MOE} = Z \times \sqrt{\frac{p(1 - p)}{n}}

where:

  • ZZ is the Z-score corresponding to the desired confidence level (for 95%, Z1.96Z \approx 1.96)
  • pp is the sample proportion (76%, or 0.76)
  • nn is the sample size (1655)

Step-by-Step Solution:

  1. Convert 76% to a decimal: p=0.76p = 0.76

  2. Compute p(1p)p(1 - p): p(1p)=0.76×(10.76)=0.76×0.24=0.1824p(1 - p) = 0.76 \times (1 - 0.76) = 0.76 \times 0.24 = 0.1824

  3. Divide by the sample size nn: 0.182416550.0001102\frac{0.1824}{1655} \approx 0.0001102

  4. Take the square root: 0.00011020.0105\sqrt{0.0001102} \approx 0.0105

  5. Multiply by the Z-score for a 95% confidence level (1.96): MOE=1.96×0.01050.0206\text{MOE} = 1.96 \times 0.0105 \approx 0.0206

  6. **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