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I have a = 1.2 r = .9 so answer is 1.2/(1-.9) = 1.2/.1 = 12 a/1-r works when |r| < 1

I didn't circle the answer on my exam, just going from memory of what I put. 1. b 2. a 3. d 4. c - I was trying to choose between live and simulated as I mainly remember hearing about live test data... but I was thinking live data was from real sources, not fictional. simulated test data also...