MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 250 engines and the mean pressure was 8.0 pounds/square inch (psi). Assume the population standard deviation is 0.8 . If the valve was designed to produce a mean pressure of 7.9 psi, is there sufficient evidence at the 0.05 level that the valve performs above the specifications?

Step 1 of 6 : State the null and alternative hypotheses.

 
 
 
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An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 250 engines and the mean pressure was 8.0 pounds/square inch (psi). Assume the population standard deviation is 0.8 . If the valve was designed to produce a mean pressure of 7.9 psi, is there sufficient evidence at the 0.05 level that the valve performs above the specifications?

Step 5 of 6 : Identify the level of significance for the hypothesis test.

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Follow-up Question

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 250 engines and the mean pressure was 8.0 pounds/square inch (psi). Assume the population standard deviation is 0.8 . If the valve was designed to produce a mean pressure of 7.9 psi, is there sufficient evidence at the 0.05 level that the valve performs above the specifications?

Step 5 of 6 : Identify the level of significance for the hypothesis test.

Solution
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