Laia, H.F. and Zahedi 2022. Implementation of Autoregresssive Integrated Moving Average (ARIMA) on Forecasting the Number of Positive Cases of Covid-19 in North Sumatra on September 2021: Implementasi Autoregresssive Integrated Moving Average (ARIMA) Pada Peramalan Jumlah Kasus Positif Covid-19 Sumatera Utara Pada September 2021. Journal of Mathematics Technology and Education. 1, 3 (Jun. 2022), 229-241. DOI:https://doi.org/10.32734/jomte.v1i3.8820.