The note shows the processing and analysis of the yield of cotton, cotton fiber for a certain period of observation Based on the random nature of cotton yields and the quality of cotton fiber over 15 years (2001-2015), the average yields of cotton fiber have been studied. As a result, collected statistical data. Having developed the data obtained criterion Darbin - Watson. An interval estimate for the average yield of cotton fiber was constructed. With the help of such an interval estimate, forecasting is proposed for future years to come.