Do left-handed or right-handed people make more money? one study1 recorded the hourly earnings for a random sample of american men, of whom were right-handed and were left-handed. the right-handed men earned an average of per hour, while the left-handed men earned an average of per hour. the sample standard deviation for both left-handed and right-handed workers was about . test the hypothesis that the average earnings for left-handed and right-handed men are the same.
