Comparing first- and second-year sales. As part of the first-year evaluation for new salespeople,
a large food-processing firm projects the secondyear sales for each salesperson based on his or her sales for the first year. Data for n = 8 salespeople are shown in the table.
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(a) Give the equation relating the coded variable u to first-year sales, x, using the coding system for observational data.
(b) Calculate the coded values, u.
Ă‚Â (c) Calculate the coefficient of correlation r between the variables x and x2.
Ă‚Â (d) Calculate the coefficient of correlation r between the variables u and u2. Compare this value to the value computed in part c.