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In: Statistics and Probability

An engineer has designed a valve that will regulate water pressure on an automobile engine. The...

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 190 engines and the mean pressure was 6.0 pounds/square inch (psi). Assume the population standard deviation is 0.8. If the valve was designed to produce a mean pressure of 6.1 psi, is there sufficient evidence at the 0.02 level that the valve does not perform to the specifications?

State the null and alternative hypotheses.

Find the value of the test statistic.

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