An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 210 engines and the mean pressure was 5.0 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 4.9 psi. It is believed that the valve does not perform to the specifications. A level of significance of 0.02 will be used. Find the value of the test statistic.

The test statistics is

Step-by-step explanation:

From the question we are told that

    The  sample size is  n  =  210  

     The  sample  mean is  

       The  standard deviation is  

       The  population   mean is  

Generally the test statistics is mathematically evaluated as

     =>    

=>        

  q

step-by-step explanation:

each line from a vertex to the midpoint of the opposite side is called a median. the point where the medians intersect, point q, is the centroid.

the centroid of δabc is point q.