I made the linear regression equation and it is correct. Not sure what I'm doing wrong in part D. All I'm supposed to do is substitute the 4 in the equation but my answer is wrong somehow?

The American Association of Individual Investors (AAII) On-Line Discount Broker Survey polls members on their experiences with electronic trades handled by discount brokers. As part of the survey, members were asked to rate their satisfaction with the trade price and the speed of execution, as well as provide an overall satisfaction rating. Possible responses (scores) were no opinion (O), unsatisfied (1), somewhat satisfied (2), satisfied (3), and very satisfied (4). For each broker, summary scores were computed by computing a weighted average of the scores provided by each respondent. A portion the survey results follow (AAII website, February 7, 2012). Brokerage Scottrade, Inc. Satisfaction with Satisfaction with Overall Satisfaction with Trade Price Speed of Execution Electronic Trades 3.4 3.1 3.4 Charles Schwab 3.0 3.3 3.3 3.1 3.3 4.0 Fidelity Brokerage Services TD Ameritrade 2.8 3.5 3.7 2.9 3.2 2.9 2.4 3.2 2.7 E*Trade Financial (Not listed) Vanguard Brokerage Services USAA Brokerage Services 2.6 3.8 2.6 2.4 3.8 3.4 Thinkorswim 2.6 2.6 2.7 Wells Fargo Investments 2.3 2.7 2.3 Interactive Brokers 3.7 3.9 4.0 Zecco.com 2.5 2.5 2.5 Firstrade Securities 3.0 3.0 3.0 Banc of America Investment Services 4.0 1.0 2.0 (a) Develop an estimated regression equation using trade price and speed of execution to predict overall satisfaction with the broker. Let x1 represent satisfaction with Trade Price. Let x2 represent satisfaction with speed of execution. If required, round your answers to four decimal places. For subtractive or negative numbers use a minus sign even if there is a + sign before the blank. (Example: -300) + -0.9438 0.6017 0.7278 + X1 X2 (a) Develop an estimated regression equation using trade price and speed of execution to predict overall satisfaction with the broker. Let xi represent satisfaction with Trade Price. Let x2 represent satisfaction with speed of execution. If required, round your answers to four decimal places. For subtractive or negative numbers use a minus sign even if there is a + sign before the blank. (Example: -300) + -0.9438 0.6017 X1 + 0.7278 X2 What is the coefficient of determination? If required, round your answers to four decimal places. 0.7084 Interpret the coefficient of determination. If required, round your answer to one decimal places. The regression model explains approximately 70.84 % of the variation in the values of overall satisfaction in the sample. (d) Finger Lakes Investments has developed a new electronic trading system and would like to predict overall customer satisfaction assuming they can provide satisfactory levels of service levels (4) for both trade price and speed of execution. Use the estimated regression equation developed in part (a) to predict overall satisfaction level for Lakes Investments if they can achieve these performance levels. If required, round your answer to one decimal places. Do not round intermediate calculations. 4.4 (e) What concerns (if any) do you have with regard to the possible responses the respondents could select on the survey? The input in the box below will not be graded, but may be reviewed and considered by your instructor. blank