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:

Let alpha = 0.05.

1.7 15.5 2.0 45.1 27.6 45.0 1.0 66.4 6.9 13.5 1.9 31.2 30.9 36.6 1.1 4.8 33.2 27.1 20.7 23.7 .8 1.1 18.2 9.7 28.1 67.4 2.5 61.7 16.2 2.0 9.0 2.6 29.7 13.5 2.6 23.6 9 7.6 23.5 36.7 3.2 38.0 18.2 31.7 14.4 6.3 40.2 2.4 3.5 21.8