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# Regression Coefficient, Confidence Interval

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A brokerage house wants to predict the number of trade executions per day, using the number of incoming phone calls as a predictor variable. Data were collected over a period of 35 days and are stored in the file trades.xls.

a. Use the least-squares method to compute the regression coefficients b0 and b1.
b. Interpret the meaning of b0 and b1 in this problem.
c. Predict the number of trades executed for a day in which the number of incoming calls is 2,000.
d. Should you use the model to predict the number of trades executed for a day in which the number of trades executed for a day in which the number of incoming call is 5,000? Why or why not?
e. Determine coefficient of determination, and explain its meaning in this problem.
j. Construct a 95% confidence interval estimate of the mean number of trades executed for days in which the number of incoming calls is 2,000.
k. Construct a 95% prediction interval of the number of trades executed for a particular day in which the number of incoming calls is 2,000.