The following data show the daily closing prices (in dollars per share) for IBM for November 3, 2005, through December 1, 2005 (Compustat, February 26, 2006).

a. Define the independent variable Period, where Period = 1 corresponds to the data for November 3, Period = 2 corresponds to the data for November 4, and so on. Develop the estimated regression equation that can be used to predict the closing price given the value of Period.
b. At the .05 level of significance, test for any positive autocorrelation in the data.

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