Statement - I: Standard error of the mean is the standard deviation of the sampling distribution of mean. Statement - II: Simple random sampling is non-probability sampling method. Which of the following combination is correct?

Statement I is correct because the standard error of the mean literally measures the variability of sample means around the true population mean. Statement II is false because simple random sampling IS a probability sampling method: every unit has a known, non-zero probability of selection, which distinguishes it from non-probability methods like convenience sampling.