Can we conclude that the mean age of death of homogenous sickle cell disease is less than 30yrs . A sample of 50patients yielded the following ages in years. 15.5 2.0 45.1 1.7 0.8 1.1 18.2 9.7 28.1 18.2 27.6 45.0 1.0 66.4 2.0 67.4 2.5 61.7 16.2 31.7 6.9 13.5 1.9 31.2 9.0 2.6 29.7 13.5 2.6 14.4 20.7 30.9 36.6 1.1 23.6 .9 7.6 23.5 6.3 40.2 23.7 4.8 33.2 27.1 36.7 3.2 38.0 3.5 21.8 2.4 Let = 0.05. What assumptions are necessary