If a sample is selected using random sampling methods,the primary reason that the sample mean might be different than the corresponding population mean is that the sample might be biased.

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Quizplus · Accepted Answer

The primary reason that the sample mean might be different than the population mean is due to sampling error, not bias. While bias can also affect the accuracy of a sample, it is not the primary reason for differences in means.

If a Sample Is Selected Using Random Sampling Methods,the Primary