The file P12_16.xlsx contains the daily closing prices of American Express stock for a one-year period. a.
Question:
a. Use the random walk model to forecast the closing price of this stock on the next trading day.
b. You can be about 95% certain that the forecast made in part a will be off by no more than how many dollars?
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Related Book For 
Data Analysis and Decision Making
ISBN: 978-0538476126
4th edition
Authors: Christian Albright, Wayne Winston, Christopher Zappe
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