An engineer has designed a valve that will regulate water pressure on an automobile engine. the valve was tested on 170 engines and the mean pressure was 4.9 lbs/square inch. assume the variance is known to be 1. if the valve was designed to produce a mean pressure of 5 lbs/square inch, is there sufficient evidence at the 0.02 level that the valve does not perform to the specifications? state the null and alternative hypotheses for the above scenario.

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colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.

answer: option c.

explanation:

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.