the scores provided by each respondent. A portion of the survey results follows
ID: 3318552 • Letter: T
Question
the scores provided by each respondent. A portion of the survey results follows (AAII website, February 7, 2012). Click on the datafile logo to reference the data. DATA file 2,7 2.8 3,6 2.1 Satisfaction Trade Speed of Electronic Brokerage Price Execution Trades Scottrade, Inc. 3.4 3.4 3.5 Charles Schwab 3.2 3.3 3.4 Fidelity Brokerage Services 3.1 3.4 3.9 TD Ameritrade 2.9 3.7 E*Trade Financial 2.9 2.9 (Not listed) 2.5 Vanguard Brokerage Services 2.6 USAA Brokerage Services 2.4 Thinkorswim 2.6 2.6 Wells Fargo Investments 2.3 2.3 Interactive Brokers 3.7 4.0 4.0 Zecco.com 2.5 2.5 2.5 Firstrade Securities 3.0 3.0 4.0 Banc of America Investment Services 4.0 a. Develop an estimated regression equation using trade price and speed of execution to predict overall satisfaction with the broker (to 4 decimals). Enter negative values as negative numbers, if required. j = 0.78390+0.5580 OTrade Price + 7342 - Speed of Execution b. 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 (3) for both trade price and speed of execution. Use the estimated regression equation developed in part (a) to predict overall satisfaction level for Finger Lakes Investments if they can achieve these performance levels (to 1 decimal). 1.0 3.1 c. Develop a 95% prediction interval of overall satisfaction for Finger Lakes Investments assuming they achieve service levels of 3 for both trade price and speed of execution (to 1 decimal). Prediction interval isotoExplanation / Answer
a)
The regression equation is
Satisfaction = - 0.7840 + 0.558 Trade Price + 0.734 Seed of Execution
c) 95% prediciton interval : (2.156, 4.030)
Answer: (2.2, 4.0)
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