Assigning homework is unlikely to have a positive effect on any of these variables.

布置作业不太可能对这些因素产生什么积极影响。

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Internal validity - is there true cause and effect between variables.

内部有效性——在条件变化的时候，其成因和结果还会是真实的么？

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Internal validity - is there true cause and effect between variables.

内部有效性——在条件变化的时候，其成因和结果还会是真实的么？

youdao