Estimating the Size of a Sample to Study Youngsters Driving Under Drugs or Alcohol
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Question
A survey in Australia found that 21% of all Americans aged 16 to 20 drove under the influence of drugs or alcohol. A similar survey is planned for New Zealand. How large a sample is required if they want a 95% confidence interval to be accurate within 3.5%?
Summary
The question belongs to Statistics and it is about estimating the percentage of youngsters between 16-0 driving under drugs or alcohol. The test is to be conducted in New Zealand and the sample size is to be estimated.
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