A medical doctor states that the mean age of his patients is 47 years. A random sample of 50 of his patients was selected and their age was recorded. The ages were inputted into MINITAB for analysis. Exhibit 1 below shows the results of an analysis carried out on the data obtained: Exhibit 1 Test of mu = 47 vs mu not = 47 The assumed sigma = 18.0 Variable N Mean StDev SE Mean. Z P Age 50 45.6 18.1 2.6. * ** (a) State the null and the alternative hypotheses for this test. (b) Calculate the missing Z value '*'. (c) Determine the missing P value '**'. Interpret your answer for the P value. (d) Explain the term 'level of significance'. (e) If you were the student conducting this test, what would you conclude and why