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Prepare the ACF and PACF for the first differenced data. Identify one plausible ARIMA model based on these plots. Justify your selection. I suggested ARIMA

Prepare the ACF and PACF for the first differenced data. Identify one plausible ARIMA model based on these plots. Justify your selection.

I suggested ARIMA (0,1,1) but I am not certain.

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