Enter T for true or F for false: 1. Time series data are visualized graphically by plotting the variable of interest on the Y-axis and time on the X-axis. 2. Time is the causal variable in the model. 3. Classical time series models are always written as linear regressions on four variables: trend, cycle, season, and random irregularities. 4. Time series models may contain combinations of sums and products of the classical variables.

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