3. Computing the regression line and making predictions Suppose you are a dolphin trainer at SeaWorld. You teach the dolphins by rewarding them with fish treats after each successful attempt at a new trick, The following table lists the dolphins, the number of treats per success given to each, and the average number of attempts necessary for each to learn to perform the tricks. Dolphin Diana Number of Treats Number of Attempts 2 6 Frederick 4 5 Fatima 1 8 Marlin 3 5 You can use the preceding sample data to obtain the regression line, where is the predicted value of Y: = bX+a One formula for the slope of the regression line is as follows: b = SP SS NUMBER OF ATTEMPTS 10 6 8 6 5 3 2 1 0 O 2 3 NUMBER OF TREATS 4 5 Regression Line (?