A sales manager ranks 10 people at the end of their training on the basis of their sales potential. A year later, the number of units sold by each person is determined. The following data and MegaStat output are obtained. Note that the manager's ranking of l is "best."

a. Find rs on the Excel add-in (MegaStat) output and use Table 18.13 to find the critical value for testing H0: p, = 0 versus Hα: ps ‰  0 at the .05 level of significance. Do we reject H0?
b. The MegaStat output gives approximate critical values for a = .05 and a = .01. Do these approximate critical values, which are based on the t distribution, differ by much from the exact critical values in Table 18.13 (recall that n = 10)?

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Person 1 2 3 4 5 6 78 9 10 Managers Ranking, x 7 4 26 Units Sold, y 10 3 5 9 8 770 630 820 580 720 440 690 810 560 470 MgrRank, x UnitSold, y x 1721| 1.000|1 1.000 .632 critical value .05 (two-tail) .765 critical value .01 (two-tail) Unitsold, y 10 sample size