With increasing sample size, random variations of the effect are smaller.

随着样本量的增加，作用的随机变化减小。

youdao

Random variations of one or more characteristics of any entity such as voltage, current, or data.

电压、电流或数据等任何实体的一种或多种特性的随机变化。

youdao

The scientists checked the data for all possible natural influences such as the lunar cycle as well as random variations and found neither to be at play.

科学家们检查了所有可能造成这种变化的自然因素，例如月亮运行周期和随机的变化，结果发现二者都不起作用。

youdao

Since they saw stock and bond prices as largely random variations from the average, they saw the risk to their portfolios as relatively low.

FORBES: Christmas, Kurtosis, Fat Tails, Black Swans And Risk Management, Pt. 2