Abstract: After describing the principle of confidence intervals and prediction intervals，this paper，which applies it to analyze the relationship between such two variables as student size and quarterly turnover，tests regression equation.And the result shows that there exists high degree of fitting between these two variables since there exists a positive linear relationship between the two variables (r=0.950 1) and about 90.27% of the variation in the quarterly turnover data is explained by student size;The paper offers not only confidence intervals for the mean of y and prediction intervals for an individual y by using estimated equation，but some relevant graphs as well.

Key words: regression analysis, confidence intervals, prediction intervals, student size, quarterly turnover