为了保证数据的代表性，他们采访了来自不同背景的1000人。

To ensure the ___representativeness of the data, they interviewed 1000 people from diverse backgrounds.

这份调查样本的代表性不足，无法准确反映整个群体的意见。

The survey's lack of ___representativeness means it can't accurately reflect the whole population's views.