According to the National Health Statistics Reports, the mean height of U.S. men is 69.5 inches. In a sample of n=300 men (between the ages 60-69), the mean height was a = 69 with o = 2.84 . Public health officials want to determine whether the mean height / for older men is less than usual height. Test at 5% significance level. Some parts need Rguroo. Refer to the activity instructions for guidance. a) The parameter of interest is [ Select ] b) a= [ Select ] % and the observed value is [ Select ] c) The null hypothesis is Ho : / [ Select ] VS. Ha : H [ Select ] d) Conclusion: Since the P-value=P(a