Although randomsampling used for many surveys fails to cover large segments of the population, the procedure nonetheless offers insight into voting and consumption patterns.
虽然许多调查所用的随机取样不能覆盖大部分人口，但是这一过程使人们能更深刻地理解选举和消费的模式。
2
Most statisticians would not argue if you decided to reject the null hypothesis that the results can be accounted for in terms of randomsampling variability from the null distribution.
如果您决定 排除虚假设— 结果可以按照零分布的随机抽样可变性获得，那么大多数统计师都不会有争议。
3
To test your null hypothesis, you want to know the probability of obtaining a value this extreme under the assumption that it is due to randomsampling variability.