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a) Write the mathematical formula for each of the following models: Moving Average model, Autoregressive model, and ARMA model. [10 marks] b) What is the

a) Write the mathematical formula for each of the following models: Moving Average model, Autoregressive model, and ARMA model. [10 marks] b) What is the definition of a weakly stationary process? [10 marks] c) Consider the following graph: 4 0- -4 100 200 300 400 500 600 700 800 900 1000 Does this series look like it is stationary? Explain your answer. [10 marks]

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