Example 1. Do a full hypothesis test. Use the P-Value Method and clearly show all eight steps given in the book. Verify the value of the test statistic using a manual calculation (showing all work), technology is recommended for the rest of the problem. Employees at a construction and mining company claim that the mean salary of the company's mechanical engineers is less than that of the one of its competitors, which is $68,000. A random sample of 20 of the company's mechanical engineers has a mean salary of $66,900. Assume the sample standard deviation is $5500 and the population is normally distributed. At a = 0.05, test the employees' claim. (you don't need to show comments like this) 1. Claim u a, outside of rejection zone, fail to reject Ho 8. At the 5% level of significance, there is not sufficient evidence to support the employee's claim that the mean salary is less than $68,000.