A collector of antique grandfather clocks sold at auction believes that the price received for the clocks depends on both the age of the clocks and the number of bidders at the auction. A sample of 32 auction prices of grandfather clocks, along with their age and the number of bidders is given. Coefficient Standard Error (Intercept) -1339.0 173 . 8 AGE 12. 7406 0. 9047 NumBIDS 85.953 8 . 729 ANALYSIS OF VARIANCE Source of Degrees of Sum of Mean Variation Freedom Squares Square F Regression 4283063 Error 516727 Construct 98% confidence interval of Ba. O (67.18, 104.72) O (64.46, 107.44) (77.224 , 94.682) O (64.42, 107.49) O (71.12, 100.78)