1 / 7

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.

andersonc
Download Presentation

Chapter 7 Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related