"Proponents of a local ballot measure conduct a survey of the city by randomly selecting 100 potential voters from each of its 18 zip codes" is an example of stratified sampling

Step-by-step explanation:

The stratifed samplig methos its a probabilistical method that takes all the universe studied and divide this into different groups. In this case the universe is all the population divided into the 18 zip codes).

After that, it randonbly selects the subjects of every group and generates the statistical sample.

In this case, it can be used the proportional stratified samplig where you take the porportion of voters in every zip code and use ir¡t as the number of voters selected on every zip code.

How does it can be perform? . Let's see: For example:

Percentaje on the total population in zip code 1: 18%
Number of subjects of zip code 1 in the sample: 18
and so on...

So you will have a 100 subject`s sample based on the method of proportional stratified sampling

It can also use the non proportional stratified sampling method taking the same number of subjects on every zip code.

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3 years ago