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pickupchik [31]
3 years ago
6

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 120 engines

and the mean pressure was 3.9 pounds/square inch (psi). Assume the population standard deviation is 0.9. The engineer designed the valve such that it would produce a mean pressure of 4.1 psi. It is believed that the valve does not perform to the specifications. A level of significance of 0.05 will be used. Find the value of the test statistic. Round your answer to two decimal places.
Mathematics
1 answer:
Serggg [28]3 years ago
4 0

Answer:

Idk idc

Step-by-step explanation:

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