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Chapter 8: Confidence Intervals

Expert-verified
Introductory Statistics
Pages: 443 - 504
Introductory Statistics

Introductory Statistics

Book edition OER 2018
Author(s) Barbara Illowsky, Susan Dean
Pages 902 pages
ISBN 9781938168208

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168 Questions for Chapter 8: Confidence Intervals

  1. The standard deviation of the weights of elephants is known to be approximately 15pounds. We wish to construct a 95% confidence interval for the mean weight of newborn elephant calves. Fifty newborn elephants are weighed. The sample mean is 244 pounds . The simple standard deviation is 11 pounds.

    Found on Page 477

  2. If the Census wants to increase its level of confidence and keep the error bound the same by taking another survey, what changes should it make?

    Found on Page 477

  3. What is meant by the term “90%confident” when constructing a confidence interval for a mean?

    Found on Page 485

  4. What is meant by the term “90%confident” when constructing a confidence interval for a mean?

    Found on Page 485

  5. The Federal Election Commission collects information about campaign contributions and disbursem

    Found on Page 485

  6. The American Community Survey (ACS), part of the United States Census Bureau, conducts a yearly census similar to the one taken every ten years, but with a smaller percentage of participants. The most recent survey estimates with 90%confidence that the mean household income in the U.S. falls between $69,720and$69,922. Find the point estimate for mean U.S. household income and the error bound for mean U.S. household incom

    Found on Page 485

  7. The average height of young adult males has a normal distribution with a standard deviation of 2.5 inches. You want to estimate the mean height of students at your college or university to within one inch with 93 per cent confidence. How many male students must you measure?

    Found on Page 485

  8. In six packages of “The Flintstones® Real Fruit Snacks” there were five Bam-Bam snack pieces. The total number of snack pieces in the six bags was 68.We wish to calculate a 96%confidence interval for the population proportion of Bam-Bam snack pieces.

    Found on Page 485

  9. A random survey of enrollment at 35 community colleges across the United States yielded the following figures:

    Found on Page 486

  10. Suppose that a committee is studying whether or not there is waste of time in our judicial system. It is interested in

    Found on Page 486

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