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1. A sample of the reading scores of 35 fifth-graders has a mean of 82. The standard deviation of the population is 15. Find the 95% confidence interval of the mean reading scores of all fifth-graders. Please round to the nearest whole number and write your answer in the form ( , ); for example (31,34) or (25,46). Do not type in any extra spaces.
2. A sample of the reading scores of 35 fifth-graders has a mean of 82. The standard deviation of the population is 15. Find the 99% confidence interval of the mean reading scores of all fifth-graders. Please round to the nearest whole number and write your answer in the form ( , ); for example (31,34) or (25,46). Do not type in any extra spaces.
3. A study of 35 golfers showed that their average score on a particular course was 92. The standard deviation of the population is 5. Find the 95% confidence interval of the mean score for all golfers. Please round to the nearest whole number and write your answerin the form ( , ); for example (31,34) or (25,46). Do not type in any extra spaces.
4. A sample of six college wrestlers had an average weight of 276 pounds with a sample standard deviation of 12 pounds. Find the 90% confidence interval of the true mean weight of all college wrestlers. Please round to the nearest whole number and write your answer in the form ( , ); for example (31,34) or (25,46). Do not type in any extra spaces.
5. For a group of 10 men subjected to a stress situation, the mean number of heartbeats per minute was 126 and the standard deviation was 4. Find the 95% confidence interval of the true mean. Please round to the nearest whole number and write your answer in the form ( , ); for example (31,34) or (25,46). Do not type in any extra spaces.
6. Thirty-five percent of adult Americans are regular voters. A random sample of 250 adults in a medium-size college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence. Please round to the nearest thousandth and write your answer in the form ( , ); for example (31,34) or (25,46). Do not type in any extra spaces.
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