1. A recent report claims that college non-graduates get married at an earlier age than college graduates. To supportthe claim, tandom samples of size 100 were selected from each group, and the mean age at the time of marriagewas recorde
(D) The mean and standard deviation of the college non-graduates were 21.6 years and 3 years,respectively, while the mean and standard deviation of the college graduates were 23.2 years and 4 years,respectively. To test the claims of the report at the 0.05 level of significance, the figure of the appropriate teststatistic is__________.