下列有关研究假设的描述不正确的有
A.假设是关于两个或更多变量之间关系的陈述
B.每个研究都一定会有假设
C.研究假设也常常应用于质性研究中
D.研究假设的形成提供了研究的焦点
E.假设的形成一定要有文献支持或理论基础
正确答案是BC
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Passage One
Many people believe thatbeavers are intelligent animals. After all,their dams are fine examples of engineering. The engineering featsof beavers are well known, but it will be useful to recall t