# AP Statistics : How to do a random selection for a survey

## Example Questions

### Example Question #1 : How To Do A Random Selection For A Survey

Which of the following is the best way to ensure a sample is representative and unbiased?

Take a convenience sample

Take a voluntary response sample

Take a random sample

Take a census

Take a random sample

Explanation:

Taking a random sample is the only data-collecting method that ensures that every set of individuals has an equal chance of being selected for the sample and does not introduce any significant bias. Taking either a voluntary response sample or a convenience sample does not ensure these important aspects, as there is some unwanted selectivity involved in the data being collected. Taking a census is inferior to taking a sample of any sort, as it is both costly and time-consuming.

### Example Question #6 : How To Conduct A Sample Survey

John would like to find out what percentage of residents in his neighborhood enjoy shopping. Which of the following is the best method to randomly select participants to take John's survey?

There is no effective way to randomly select participants to be surveyed

John can number residents his neighborhood and randomly select residents to survey using a random number generator

John can sit at the park in his neighborhood and survey every individual that passes by to determine if they enjoy shopping

John can go to his local grocery store and survey individuals at random to determine if they enjoy shopping

John can go to his local mall and survey individuals at random to determine if they enjoy shopping