设随机变量<img src="https://static.zxtiku.com/wangke/imgs/topic/59930c7e1d0bd648305898a50b53cc50.jpg"/>服从自由度为<img src="https://static.zxtiku.com/wangke/imgs/topic/11cf6fe50c5ff390a282562b902ed675.jpg"/>的<img src="https://static.zxtiku.com/wangke/imgs/topic/10fa75a86d8004848a4623538af650ea.jpg"/>分布, 则<img src="https://static.zxtiku.com/wangke/imgs/topic/981f63d6022343c00a87f3c9aaf451be.jpg"/>与<img src="https://static.zxtiku.com/wangke/imgs/topic/59930c7e1d0bd648305898a50b53cc50.jpg"/>同分布. （）