Question

Can we conclude that the mean age at death of patients with homozygous sickle-cell disease is less than 30 years? A sample of 50 patients yielded the following ages in years: 15.5 2.0 45.1 1.7 .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 a alpha :05. What assumptions are necessary?

calculate step by step without using minitab or Rstudio

Answer 1