问题如下：
Sampling error is:
选项：
A.An error that occurs in the procedure of collecting, recording, and tabulating data.
B.An error comes from the scare number of the sample which is less than 20.
C.The difference between a sample statistic used to estimate a population parameter and the actual but unknown value of the parameter.
解释：
C is correct.
the difference between the sample and population values is considered as a sampling error. A typical example is that the difference between the mean of sample and the mean of the whole population.
A的表述错误在哪儿呢？
