Total blood volume in ml per body weight in kg, is important in medical research. For healthy adults, the red blood cell volume is about = 28 ml/kg. Suppose Roger has had seven blood tests and the mean red blood cell count was 32.7 ml/kg. Assume that x has a normal distribution and = 4.75. Do the data indicate that Roger's red blood cell volume is different either way from u = 28 ml/kg? Use a = 0.01.