The height of students in a statistics class is about normal with a mean of 68 inches and a standard deviation of 2.75 inches. Suppose the heights of the 15 male students in the statistics class are also approximately normal with an average of 71 inches. Would the standard deviation for males in the class be greater than 2.75 inches, exactly 2.75 inches, or less than 2.75 inches? I think there is a problem here. What if there are 215 students in the stat class, of which 15 are male. The other 200 are women. For class stats, females overwhelm males, so class stats largely reflect females, and males are just in the noise. Now, standard deviation: I don’t see how an analysis can be done without making assumptions about class size.