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.
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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