老师麻烦解释一下这个题

问题如下：

Question A descriptive measure of a population characteristic is best described as a:

选项：

A.parameter.

B.sample statistic.

C.frequency distribution.

解释：

A is correct. Any descriptive measure of a population characteristic is called a parameter.

B is incorrect. A sample statistic is a quantity computed from or used to describe a sample.

C is incorrect. A frequency distribution is a tabular display of data summarized into a relatively small number of intervals.