1) Use Yahoo Finance to download the monthly closing price for Roku's stock (ROKU) for 13 months back. Then do the same for the S\&P 500 index (^GSPC), and the 13 Week Treasury Bill index (^IRX). a) Calculate the monthly excess returns for Roku and the S\&P 500 index over at least 12 months and show the average excess returns for each. b) What is the beta of Roku? c) What is the alpha of Roku? d) What is the standard error for Roku's beta? e) What is the 95% confidence range for Roku's beta