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You should guess what the causes for the changes in the data are.（）

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What are the causes for the changes The causes for the changes include where people live, when people get married, and the number of homes that have a TV.（）

描述性观察法,包括、、

现金的清查方法应采用。现金的清查方法应采用

描述性观察法,包括、和