A cognitive psychologist was curious as to why women tend to physically turn a map’s position to match the direction they are moving in, while men tend to keep the map in its original position and mentally change orientations as they move. She wondered if there is a sex difference in the ability to mentally rotate objects. She devised a computerized experiment in which she timed correct responses to a mental visual rotation task at a given angle. Now let’s suppose that she did not obtain equal numbers of men and women for her study. For illustrative purposes, we have dropped the last 5 female cases from that previous example. Here are the times, in seconds, for 15 men and 10 women. Conduct a one-tailed t test at the .01 α level. Are men able to mentally rotate objects significantly faster than women?

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Men M = 0.22 SS = 0.98 n = 15 Women M = 0.25 SS = 0.07 n = 10