例句與造句

1. :If you assume that both the people who turn up to place a vote, and the people polled, are random samples of the population, then you can estimate the margins of the vote pretty easily, although you might want to look into methods for sampling a finite population-the main thing is that you introduce a finite population correction into your estimate of variance, which relates to the fraction of the population you sample ( with the important result that if you sample everyone, the variance becomes zero because you know the values for the population with certainty ).
2. It's difficult to find finite population correction in a sentence. 用finite population correction造句挺難的