In the past, the average age of employees of a large corporation has been 40 years. Recently, the company has been hiring older individuals. In order to determine whether there has been an increase in the average are of all employees, a sample of 64 employees was selected. The average age in the sample was 45 years with a sample deviation of 16 years. Let = .05.a. State the null and the alternative hypothesesb. Compute the test statisticc. Using the critical value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years

Are these correct/how to do part C:

A:

Ho: m greater than or = to 40

Ha: m > 40

B:

does part b = 2.5?

C:

How to do part C?