Description: A household electrical appliance enterprises in the country in sales of second-tier cities, Y (unit: million units) and the urban population, the number of X1 (unit: million) and the city' s per capita monthly income X2 (unit: yuan) between, in a particular year made a survey of 15 cities, was the amount of the above observations (see data sheet data1.txt)
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实验三代码
..........\text1-1.sas
..........\text2-2.sas
..........\text2-3.sas
..........\text2-4.sas
..........\text2.sas
..........\exersice2_6.txt
..........\exersice2_9.txt
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