3 sentences

1. 他在大学主修统计学。

   tā zài dà​xué zhǔ​xiū tǒng​jì​xué.

   He majored in statistics at university.

   Source: Dong Chinese Dictionary

2. 统计学中的样本必须能代表母体的特征。

   tǒng​jì​xué zhōng de yàng​běn bì​xū néng dài​biǎo mǔ​tǐ de tè​zhēng.

   In statistics, a sample must be representative of the characteristics of the population.

   Source: Dong Chinese Dictionary

3. 两组数据之间的差异在统计学上并不显著。

   liǎng zǔ shù​jù zhī​jiān de chā​yì zài tǒng​jì​xué shàng bìng bù xiǎn​zhù.

   The difference between the two sets of data is not statistically significant.

   Source: Dong Chinese Dictionary