A sample of 65 candidates were assessed in three types of literacy in any particular year: prose, document, and quantitative. The scores in document literacy were the same for 17- to 20-year-olds and for 35- to 50-year-olds. A random sample of scores from a later year showed the following statistics. Age group Mean Score Population S.D Sample size 17-20 250 50.2 35 35-50 300 52.1 30 Test the hypothesis that there is no difference in the means of the two groups.