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ARIMA Model Problems

Hi! Can anyone help me out with this question I found on my practice paper?

For part a) I think it is a ARMA (1,1) process? is that correct? and how do I calculate the mean of the ARMA model? is it the same as AR model? If it is then E(yt) - 5/ (1-0.30) = 7.14?

For part b) I identified as the AR(4). Is that correct?

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  • $\begingroup$ Please type your question as text, do not just post a photograph or screenshot (see here). When you retype the question, add the [self-study] tag & read its wiki. Then tell us what you understand thus far, what you've tried & where you're stuck. We'll provide hints to help you get unstuck. Please make these changes as just posting your homework & hoping someone will do it for you is grounds for closing. $\endgroup$ Commented Apr 29, 2020 at 15:41
  • $\begingroup$ ok sure thank you! done! $\endgroup$
    – Shane Lum
    Commented Apr 29, 2020 at 18:47
  • $\begingroup$ Thank you for reposting the question! (Next time, best to just edit this one. I have flagged this question for deletion, since we don't need it any more.) $\endgroup$ Commented Apr 30, 2020 at 8:04

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