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請問一個研究方法的問題

Oct 2nd 2013, 02:03

知識問題|

各位大大有個問題想請你們解答：
一家製造商觀到，當國民平均所得增加，品牌的需求會隨之增加；而放寬信用條件並將利率調低，銷售額也會增加。買方的購買行為會受到年齡與性別影響，影響銷售額的其他因素(例如競爭者的廣告、競爭者的經銷商折扣、引入新的競爭模式)幾乎是隨機變動的。
問題一：如果銷售額與國民平均所得呈正相關，請將上述所有變數區分為依變數、獨立變數、干擾變數、外生變數和中介變數。
問題二：評論以些假說的基礎的模型之效用。

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