If data are reported as 12 ± 20 (M ± SEM),then the standard error of the mean is equal to 20.

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In this scenario, data are reported as 12 ± 20 (M ± SEM). The M stands for the mean and SEM stands for standard error of the mean. The standard error of the mean represents how precise the sample mean is as an estimate of the population mean.

In this case, the SEM is reported as 20, which means that the standard error of the mean is equal to 20. So, the statement that the standard error of the mean is equal to 20 is true, and the answer is A.

If Data Are Reported as 12 ± 20 (M ±