While the statistical measure based upon the entire population is called a parameter, the measure based upon a sample is known as a

A statistic is a numerical value computed from a sample and used to estimate the population parameter.

Sample parameter is not a standard term because a parameter always describes the whole population, not a sample.

Inference is the reasoning process of drawing conclusions about the population, not a single measure.

None of the above is wrong because statistic exactly names the sample based measure.

A parameter is a fixed population value while a statistic varies from sample to sample.

Sample mean and sample standard deviation are common statistics used as estimators.