Suppose the average diastolic blood pressure among the population of Vigo county women population is reported to be 4 mmHg with a standard deviation of 4mmHg. Does a randomly selected sample of 20 women, having a mean diastolic blood pressure of 80 mmHg provide evidence that the average diastolic blood pressure of the population of Vigo county women is statistically lower than the reported 84mmHg ? Use alpha = 0.05
