‌洗衣机产量（<img src="https://static.zxtiku.com/wangke/imgs/topic/353bc9082bceea831190fd04bed4fa28.png"/>，台）与单位产品成本（<img src="https://static.zxtiku.com/wangke/imgs/topic/687db39412e44ab903be45e2abc637b2.png"/>，元/台）之间的回归方程为<img src="https://static.zxtiku.com/wangke/imgs/topic/51298eeb5a724f40956baf93a228d6c6.png"/>，这说明（）。‌