A sales manager for an advertising agency believes there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned. A regression analysis shows the following results: Coefficients Standard t-Stat Error p-value Intercept -12.201 6.560 -1.860 0.100 Number of Contacts 2.195 0.176 12.505 0.000 ANOVA df SS MS F Significance F Regression 1.00 13555.42 13555.42 156.38 0.00 Residual 8.00 693.48 86.68 Total 9.00 14248.90 X = 33.4. _(X - X)2 = 2814.4. The 95% prediction interval for a particular person making 30 calls is Select one: O a. 55.8, 51.5 O b. 51.4, 55.9 O c. 46.7, 60.6 O d. 31.1, 76.2