The Dailydow.xlsx file gives daily values for the Dow Jones Industrial Average Index during the period 1996–2010. What is the R-squared value when you predict tomorrow’s Dow Jones from today’s values? Does this high R-squared value mean that the market is easy to predict?

Date	Dow
1/2/1996	5177.45
1/3/1996	5194.07
1/4/1996	5173.84
1/5/1996	5181.43
1/8/1996	5197.7
1/9/1996	5130.13
1/10/1996	5032.94
1/11/1996	5065.1
1/12/1996	5061.12
1/15/1996	5043.78
1/16/1996	5088.22
1/17/1996	5066.9
1/18/1996	5124.35
1/19/1996	5184.68
1/22/1996	5219.36
1/23/1996	5192.27
1/24/1996	5242.84
1/25/1996	5216.83
1/26/1996	5271.75
1/29/1996	5304.98
1/30/1996	5381.21
1/31/1996	5395.3
2/1/1996	5405.06
2/2/1996	5373.99