Question: A neighborhood contains three compact communities, consisting respectively, of people of Anglo-Saxon, Polish, and Italian descent. There is an up-to-date directory. In it the persons in the house are listed in the following order: husband, wife, children (by age), others. Houses are listed in order along the streets. The average number of persons per house is five.

The choice is between a systematic sample of every fifth person in the directory and a 20% simple random sample. For which of the following variables do you expect the systematic sample to be more precise?

A. Proportion of people of Polish descent.

B. The proportion of males.

C. Proportion of children.

Explain your answers for A to C.