Part a. Use the area below to draw a scatter diagram. Brokerage Scottrade, Inc. Charles Schwab Fidelity Brokerage Services TD Ameritrade E*Trade Financial Vanguard Brokerage Services USAA Brokerage Services Thinkorswim Wells Fargo Investments Interactive Brokers Zecco.com Speed 3.6 3.2 3.8 3.7 3.0 2.8 3.6 2.4 2.3 3.8 2.3 Satisfaction 3.4 3.4 3.2 3.7 3.2 3.8 3.9 2.5 2.6 3.8 2.4 Part c. Formula #N/A Slope Intercept #N/A Parte. Speed of Brokerage Discussed 2.3 Average Speed of Execution #N/A Estimation of the Overall Satisfaction Rating (to 3 decimals) #N/A b. What does the scatter diagram developed in part (a) indicate about the relationship between the two variables? The scatter diagram indicates a negative linear relationship between x = speed of execution rating and y = overall satisfaction rating for electronic trades. c. Develop the least squares estimated regression equation. Satisfaction = 1 + Speed (to 3 decimals) d. Provide an interpretation for the slope of the estimated regression equation (to 3 decimals). The slope of the estimated regression line is approximately So, a one unit in the speed of execution rating will increase the overall satisfaction rating by approximately points. e. Suppose Zecco.com developed new software to increase their speed of execution rating. If the new software is able to increase their speed of execution rating from the current value of 2.3 to the average speed of execution rating for the other 10 brokerage firms that were surveyed, what value would you predict for the overall satisfaction rating? (to 3 decimals)