Nine items of a sample have the values 45. 47.50.52.48. 47. 49.53.51. If the population mean is assumed to be 47.5. Which of the following is true?

A. None
B. T-test is the most appropriate tool for testing the hypothesis u =5.4
C. Z-test is the most appropriate tool for testing the hypothesis u =5.4
D. x²-test is the most appropriate tool for testing the hypothesis u =5.4