A study by Thienprasiddhi et al (A-4) examined a sample of 16 subjects with open-angle glaucoma and unilateral hemified defects. The age (years) of the subjects were, 62, 62, 68, 48, 51, 60, 51, 57, 57, 41, 62, 50, 53, 34, 62, 61. Can we conclude the mean age of the population from which the sample may be presumed to have been drawn is less than 60 year? Let .05.