The file P16_25.xlsx contains the daily closing prices of Wal-Mart stock during a 1-year period. Use the method of moving averages with a carefully chosen span to forecast this time series for the...

The file P16_25.xlsx contains the daily closing prices of Wal-Mart stock during a 1-year period. Use the method of moving averages with a carefully chosen span to forecast this time series for the next 3 trading days. Defend your choice of the span used.

Consider the file P16_26.xlsx, which contains total monthly U.S. retail sales data. Use the method of moving averages with a carefully chosen span to forecast U.S. retail sales for the following 12 months. What makes this time series more challenging to forecast?