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.

Total marketing effort is a term used to describe the critical decision factors that affect demand: price, advertising, distribution, and product quality. define the variable x to represent total marketing effort. a typical model that is used to predict demand as a function of total marketing effort is based on the power function: d = axb suppose that a is a positive number. different model forms result from varying the constant b. sketch the graphs of this model for b = 0, b = 1, 0< b< 1, b< 0, and b> 1. (we encourage you to use excel to do this.) what does each model tell you about the relationship between demand and marketing effort? what assumptions are implied? are they reasonable? how would you go about selecting the appropriate model?