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Back to 8.2 A Confidence Interval When the Population Standard Deviation Is Unknown and Small Sample Case

8.2 Exercise 38

Avg difficulty 2.5


Use the following information to answer the next two exercises: A quality control specialist for a restaurant chain takes a random sample of size 12 to check the amount of soda served in the 16 oz. serving size. The sample mean is 13.30 with a sample standard deviation of 1.55. Assume the underlying population is normally distributed.

Find the 95% Confidence Interval for the true population mean for the amount of soda served.

  1. (12.42, 14.18)
  2. (12.32, 14.29)
  3. (12.50, 14.10)
  4. Impossible to determine

OpenStax Introductory Business Statistics 2e, 8.2 A Confidence Interval When the Population Standard Deviation Is Unknown and Small Sample Case, exercise 38

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Adapted from Introductory Business Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Business Statistics 2e. Imported at revision 50ec917.