Fundamentals of Statistics (5th Edition)
Fundamentals of Statistics (5th Edition)
5th Edition
ISBN: 9780134508306
Author: Michael Sullivan III
Publisher: PEARSON
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Chapter B.2, Problem 15AYU

Peanuts A jar of peanuts is supposed to have 16 ounces of peanuts. The filling machine inevitably experiences fluctuations in filling, so a quality-control manager randomly samples 12 jars of peanuts from the storage facility and measures their contents. She obtains the following data:

Chapter B.2, Problem 15AYU, Peanuts A jar of peanuts is supposed to have 16 ounces of peanuts. The filling machine inevitably

  1. (a) Verify that the data are normally distributed by constructing a normal probability plot.
  2. (b) Determine the sample standard deviation.
  3. (c) Construct a 90% confidence interval for the population standard deviation of the number of ounces of peanuts.
  4. (d) The quality control manager wants the machine to have a population standard deviation below 0.20 ounce. Does the confidence interval validate this desire?
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