如果一个人认为“我总是做不好事情”，这最可能是一种什么？

在管理能力的提升过程中，以下哪项最能够帮助管理者从实践中学习和反思？

将5个不同的数据进行排序，至少需要比较多少次？

某知识平台通过会员订阅制课程实现盈利，这类课程在知识商业画布中应被归类为？

A research study aims to investigate the impact of a new educational program on student performance. The study involves two groups of students: an experimental group that participates in the new program, and a control group that follows the traditional curriculum. If a pre-test is administered to both groups to establish a baseline for performance, what is the most important reason for random assignment of students to the two groups?