Causal models select one: a. provide evidence of a causal relationship between an independent variable and the variable to be forecast. b. occur whenever all the independent variables are previous values of the same time series. c. relate a time series to other variables that are believed to explain or cause its behavior. d. use the average of the most recent data values in the time series as the forecast for the next period.

What's for breakfast? all people who ate at a certain restaurant were surveyed as to what they ordered on a particular sunday morning. 40 ate eggs 42 ate sausage 32 ate pancakes 13 ate sausage and eggs 15 ate pancakes and sausage 11 ate eggs and pancakes 6 ate all three items 3 people didn't eat any of the items how many people ate only pancakes? how many people ate at the resturant that morning? how many people didn't eat eggs?