what is the standard error of the mean (sx)? we found young people underestimated the average weight of adult women in the population. Imagine you also hypothesize young people underestimate the average weight of adult men in the population (which is 191 pounds). To test this hypothesis, a group of college students are asked, "In pounds, how much does the average adult male weigh?" The data for this sample is summarized below: N = 17 x = 177.13 s = 16.64