Table P-21 contains the number of accounts (in thousands) and the assets (in billions of dollars) for

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Table P-21 contains the number of accounts (in thousands) and the assets (in billions of dollars) for 10 online stock brokerages. Plot the assets versus the number of accounts. Investigate the possibility the relationship is curved by running a multiple regression to forecast assets using the number of accounts and the square of the number of accounts as independent variables.
Table P-21 contains the number of accounts (in thousands) and

a. Give the fitted regression function. Is the regression significant? Explain.
b. Test for the significance of the coefficient of the squared term. Summarize your conclusion.
c. Rerun the analysis without the quadratic (squared) term. Explain why the coefficient of the number of accounts is not the same as the one you found for part a.

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Business Forecasting

ISBN: 978-0132301206

9th edition

Authors: John E. Hanke, Dean Wichern

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