Daily Spot Exchange Rate, U.S. Dollars per Pound Sterling (n = 60 days) Day 1 2 58 59 60 Date 11/1/19 11/4/19 11/5/19 1/28/20 1/29/20 1/30/20 Rate 1. 2950 1. 2906 1. 2870 1. 2996 1. 3012 1. 3106 Click here for the Excel Data File (b) Perform simple exponential smoothing (using Excel's Data Analysis or other software such as Minitab) using a = .05, 10, 20, and 50. The degree of smoothing varies dramatically as a is increased. (c) Which value of a do you prefer? (Round your answers to 2 decimal places.) a =