"You are the Sales Manager of Baltimore Medical Implants. You sample a total of 75 knee implants, with an observed sample mean of 375. The population mean has historically come in at 390, with standard deviation of 35. Run a hypothesis test to see if the actual sample mean is the same is the same as the population mean. Assume normal distribution." How do I know what the null hypothesis, level of significance, population of standard deviation, sample size and sample mean is?.

than:

"a) Do you accept or reject based on z-test statistic? Explain." How do I know if its good or bad?

and

"b) Do you accept or reject based on the p-value? Explain." How do I know if its good or bad?