An engineer designed a valve that will regulate water pressure on an automobile

Question

An engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that it would produce a mean pressure of 4.6 lbs/square inch. It is believed that the valve performs above the specifications. The valve was tested on 26 engines and the mean pressure was 4.9 Ibs/square inch with a variance of 0.81. A level of significance of 0.05 will be used. Assume the population distribution is approximately normal. Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places. Answer How to enter your answer Tables Keypad ! Reject Ho if r:>

Explanation / Answer

here degree of freedom =n-1= 26-1 =25

for 25 degree of freedom and right tailed test with 0.05 level ; critical value of t =1.708

reject Ho if t>1.708

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