求翻译：任务四，分析两年的取样样本数据，发现铝含量在某一数值上下摆动，建立回归方程模型，变量“alum_ppm”是一个在某一数值上下波动的变量，总体变化规律比较稳定；根据取样数据，拟合温度和铝含量的关系，发现随着温度的升高，铝含量在下降是什么意思？

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Task 4, two years of sample data, and found that aluminum in a value swing up or down, and build a regression equation model, the variable "alum, ppm" is one in a value fluctuations of the variables, the overall pattern of changes is relatively stable; the sample data, the temperature and aluminum,

The duty four, analyzes two year sample sample data, discovered the aluminum content swings about some value, establishes the regression equation model, the variable “alum_ppm” is the variable which undulates about some value, the overall change rule quite is stable; According to the sample data, th

Task four analyzed two years of sampling data, Al content found bobbing in a numerical, regression equation, the variable "alum_ppm" is a variable in one value fluctuates, the overall variation is more stable; according to the sampling data, fitting relationship between temperature and Al content, f

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