What possible sources of bias might have been introduced into the study by using this method of sampling.

由于使用该样本收集方法，该项研究有可能存在的偏见来源有哪些？

youdao

What possible sources of bias might have been introduced into the study by using this method of sampling.

由于使用该样本收集方法，该项研究有可能存在的偏见来源有哪些？

youdao