Assume the following daily closings for the Dow Jones Industrial Average: Day DJIA Day 1 7 2 8 3 DJIA 13,015 13,100 13,170 13,000 13,055 13,130 9 13,170 13,140 13,210 13,305 13,250 13,340 10 ORA 11 12 6 a. Calculate a four-day moving average for Days 4 through 12. Round your answers to two decimal places Day Moving average 4 5 6 7 8 9 10 11 12 b. Assume that the index on Day 13 closes at 13,320. Would this signal a buy or sell decision? This would signal a Select decision