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Chapter 7 Review

Chapter 7 Review. Emergency Room Accidents. In a study if 200 accidents that required treatment in an emergency room, 80 occurred at work. Find the 90% confidence interval of the true proportion of accidents that occurred at work. Length of Children’s Animated Films.

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Chapter 7 Review

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  1. Chapter 7 Review

  2. Emergency Room Accidents • In a study if 200 accidents that required treatment in an emergency room, 80 occurred at work. Find the 90% confidence interval of the true proportion of accidents that occurred at work.

  3. Length of Children’s Animated Films Use the data below is the length (min) of a random selection of popular animated films. Use the data to estimate the population variance (standard deviation) in length of children’s animated films with 99% confidence. 93 83 76 92 77 81 78 75 78 76 100

  4. Shopping Survey • A random sample of 49 shopper showed that they spend an average of $23.45 per visit at the Saturday Mornings Bookstore. The standard deviation of the population is $2.80. Find a point estimate of the population mean. Find the 90% confidence interval of the true mean.

  5. Spending for Postage • A researcher wishes to estimate within $25 the average cost of postage a community college spends in one year. If she wishes to be 90% confident, how large of a sample would be necessary if the population standard deviation is $80. 28

  6. Dog Bites Postal Worker • For a certain urban area, in a sample of 5 months, on average 28 mail carriers were bitten by dogs each month. The standard deviation of the sample was 3. Find the 90% confidence interval of the true mean number of mail carriers who are bitten by dogs each month. Assume the variable is normally distributed.

  7. Health Insurance Coverage for Children • A federal report stated that 88% of children under the age of 18 were covered by health insurance in 2000. How large a sample is needed to estimate the true proportion of covered children with 90% confidence with a confidence interval 0.05 wide.

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