By random allocation, some employees were assigned to the control group and were just given feedback about their step counts.
通过随机分配，一些员工被分到对照组，只能得到有关其步数的反馈。
This is exactly why experiments using random allocation to groups are so useful for psychologists.
这就是为什么试验使用随机的分配对心理学家如此有益。
This is exactly why experiments using random allocation to groups are so useful for psychologists.
这就是为什么试验使用随机的分配对心理学家如此有益。
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