Comparison of the Effectiveness of the Weighted Moving Average Method and Single Exponential Smoothing for Forecasting the Number of Telkomsel Customers Idzanul Iksan Sinatra, Bambang Pramono, Statiswaty Statiswaty SemanTIK : Teknik Informasi Vol. 5 No. 2 2019 DOI 10.55679/semantik.v5i2.7210