Поставить вопрос к каждому члену предложения:1Precision is obtained with the help

Precision is obtained with the help of numbers.

What is obtained with the help of numbers?

With the help of what is precision obtained?

How is precision obtained?

Statistics, when used in plural, refers to a series of connected figures.

What, when used in plural, refers to a series of connected figures?

When does statistics refer to a series of connected figures?

What does statistics, when used in plural, refer to?

To a series of what does statistics, when used in plural, refer to?

To a series of what kind of figures does statistics, when used in plural, refer to?

Statistical methods constitute definite rules of procedure in handling of data.

What methods constitute definite rulers of procedure in handling of data?

What constitutes definite rules of procedure in handling of data?

What do statistical methods do?

What do statistical methods constitute?

What kind of rules do statistical methods constitute?

Definite rules of what do statistical methods constitute?

Definite rules of what procedure do statistical methods constitute?

Definite rules of procedure in handling of what do statistical methods constitute?