Question: The closing price of a share of J P Morgan s stock

The closing price of a share of J.P. Morgan’s stock for each trading day during a one-year period is recorded in the file P12_21.xlsx.
a. Use the random walk model to forecast the closing price of this stock on the next trading day.
b. You can be about 68% certain that the forecast made in part a will be off by no more than how many dollars?

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