DATAI'iIe: Brokeratings The American Association of individual Investors (MI!) On-Llne Discount Broker Survey polls members on their experiences with discount brokers. As part of the survey, members were asked to rate the quality of the speed of execution with their oroker as well as provide an overall satisfaction rating for electronic trades. Possible responses (scores) were no opinion (0), unsatised (1), somewhat satised (2), satised (3), and very satised (4). For each broker summary scores were computed by calculating a weighted average of the scores provided by each respondent. A portion of the survey results follow: Scottra d e, Inc. Charles Schwab Fidelity Brokerage Services TD Ameritra de E*Trade Financial Vanguard Broke rage Services USAA Brokerage Services Thinkorswlm Wells Fargo Investments Interactive Brokers Zeccocom (a) Develop a scatter diagram for these data with the speed of execution as the independent variable. 4.5 4.5 4.5 . o 4.0 o I 4.0 . I . 4.0 o o '5 . 5 O 5 .- 3.5 o . g 3.5 g 3.5 g e e o . e 3' 3.0 1"; 3.0 . :3 3.0 , E 3 e . a . 2.5 c ' 2.5 ' 2.5 0' o i l l l l I l l l l l I I I ' 2.5 3.0 3.5 4.0 4.5 2.5 3.0 3.5 4.0 4.5 2.5 3.0 3.5 4.0 45 Speed of Execution G.) Speed of Execution (D Speed of Execution (D Satlsfactiun 2.5 3.0 3.5 4.0 4.5 0 speed of Execution (D (b) What does the scatter diagram developed in part {a} indicate about the relationship between me two variables? o The scatter diagram Indicates a positive linear relationship between speed of execution rating and overall satisfaction rating for electronic trades. The scatter diagram Indicates a negative linear relationship between speed of execution rating and ovelail satisfaction rating for electronic trades. The scatter diagram Indicat no noticeable linear relationship between speed of execution rating and overall satisfaction rating for electronic trades. (c) Develop the least squares estimated regression equation. (Round your numerical values to three decimal places.) (d) Provide an Interpretation for the slope of the estimated regression equation. The slope gives the overall satisfaction rating when the speed ofexecution rating is o. The slope gives the change in the speed of execution rating for every one point increase In the overall satisfaction rating. The slope gives the change in the overall satisfaction rating for every one point increase in the speed of execution rating. The slope gives the speed of execution rating when the overall satisfaction rating is o. The slope gives the change in the speed of execution rating for every one point decrease in the overall satisfaction rating. (e) Suppose Zecco.com developed new software to Increase thelr speed of execution rating. If the new software Is able to increase their speed of execution rating from the current value of 2. 5 to the average speed of execution rating for the other 10 brokerage firms that were surveyedr what value would you predict for the overall satisfaction rating? (Round your answer to one decimal place.)