(Solved): (a) Construct a time series plot. What type of pattern exists in the data? The time series plot ...

(a) Construct a time series plot. What type of pattern exists in the data? The time series plot shows a nonlinear trend. The time series plot shows a linear trend. The time series plot shows a seasonal pattern. The time series plot shows a horizontal pattern. (b) Develop a linear trend equation for this time series to forecast the budget (in bilions of dollars). (Round your numerical values to three decimal places.) $$T_t=$$ (c) What is the forecast (in billions of dollars) for period 25? (Round your answer to two decimal places.)