The file: 12 16. 16x contains the daily dosing pnces of American Express stock for an eight-week period. a. Use the random walk model to forecast the closing price of this stock on the next trading day Round your answer to the nearest cent, if necessary. b. You can be about 95% certain that the forecast made in part a will be off by no more than how many dollars? Round your answers to the nearest cent, if neccessary. \begin{tabular}{|c|c|} \hline A & B \\ \hline 223 Oct-17 & 91.71 \\ \hline 24-Oct-17 & 93.18 \\ \hline 25 Oct-17 & 92.85 \\ \hline 26 Oct-17 & 95.00 \\ \hline 27 Oct- 17 & 95.10 \\ \hline 300ct17 & 94.38 \\ \hline 31 Oct-17 & 94.83 \\ \hline 1-Nov-17 & 95.10 \\ \hline 2-Nov-17 & 95.29 \\ \hline 3-Nov-17 & 95.73 \\ \hline \end{tabular}