二是通过提高置信水平来增大样本量。
Secondly, the sample size could be enlarged through improving the confidence level.
他们还为国家一区间的置信水平，通常为90%或95%。
They also state a level of confidence for the interval, usually 90% or 95%.
他们还为国家一区间的置信水平，通常为90%或95%。
They also state a level of confidence for the interval, usually 90% or 95%.
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