5. A sample of 118 patients admitted to a hospital with a diagnosis of biliary cirrhosis had a mean IgM level (unit/ml) of 160.6. The sample standard deviation was 50.0.

Do these data provide sufficient evidence to indicate that the population mean is greater than 150 when  =0.05?

(a) List and explain the essential hypothesis testing procedure in this study.

(b) Determine the p value.

(c) Please interpret the test result.