5A study evaluated the serum acid levels in individuals with Down's syndrome and normal individuals, the study data are shown below Down's syndrome: E1: 4.5 \"I : 12 033 : 1.2 Normal individual: in = 3.4 \"2 = 14 03 = 1.5 s = .01 - Test if the mean of serum acid levels in individuals with Down's syndrome is greater than normal individuals