A doctor speculates that the red blood cell count of adults over the age of 70 is less than the larger adult population. The red blood cell count from a random sample of 42 of these older adults has a sample mean of 5.31 and a sample standard deviation of 0.54. The larger adult population has a mean of 5.4. Use a significance level of 0.01 to test whether the red blood cell count of adults over 70 is less than the larger population. a) What are the null and alternative hypotheses? Ho: > 5.4 OH1 H = 5.4 Hon = 5,4 OH1: