Question

what symbol is used for the standard deviation when it is a sample statistic? what symbol is used for the standard deviation when it is a population parameter?
for both, σ is used.
sample statistic: s. population parameter: σ.
for both, s is used.
sample statistic: σ. population parameter: s.
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Explanation:

In statistics, the symbol $s$ is used for the standard - deviation of a sample (a sample statistic), and the symbol $\sigma$ is used for the standard - deviation of a population (a population parameter).

Answer:

Sample statistic: s. Population parameter: $\sigma$.