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Statistics / Fundamentals of Statistics 4 / Chapter 10.4 / Problem 12AYU

Fundamentals of Statistics | 4th Edition | ISBN: 9780321838704 | Authors: Michael Sullivan,III

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Vehicle Emission Inspection A certain vehicle emission

Chapter 6, Problem 12AYU

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QUESTION:

Problem 12AYU

Vehicle Emission Inspection A certain vehicle emission inspection station advertises that the wait time for customers is less than 8 minutes. A local resident is skeptical and collects a random sample of 49 wait times for customers at the testing station. He finds that the sample mean is 7.34 minutes, with a standard deviation of 3.2 minutes. Does the sample evidence support the resident’s skepticism? Use the α = 0.01 level of significance.

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QUESTION:

Problem 12AYU

Vehicle Emission Inspection A certain vehicle emission inspection station advertises that the wait time for customers is less than 8 minutes. A local resident is skeptical and collects a random sample of 49 wait times for customers at the testing station. He finds that the sample mean is 7.34 minutes, with a standard deviation of 3.2 minutes. Does the sample evidence support the resident’s skepticism? Use the α = 0.01 level of significance.

ANSWER:

Problem 12AYU

Answer:

Step1:

Consider the hypothesis,

${H}_{0}:\mu{}\ =\ 8\ against$

${H}_{1}%$

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