B. A report in a business journal stated that the average time that new graduates secure their first job is within 9 months after graduation. The Principal of a recruitment agency believes the duration is not true for Malaysian graduates. She randomly selected 40 new graduates and the mean duration for this sample is 8.1 months. The standard deviation of the population is known to be 1.5 months. Can we infer that the Principal's belief is valid? Perform a test at = 0.04.