How to do sampling
Most often, you will not be able to administer the survey to all of your customers. You will need to sample the population. When conducting a survey, you need to obtain a big enough sample to make valid inferences about the population you are studying. When Nike runs a survey on running shoes, they want the results to be representative of the entire population of people who run. However, it is not possible to survey the entire population. Therefore, you need to sample the population.
Types of sampling
There are three types of sampling:
- Census: You survey the entire population. We know the sample is representative because you are surveying the entire population. This is not feasible in most cases.
- Judgmental: You select the sample based on your judgment. This is not a random sample, and hence it is not representative of the population in general. For example, you might select the sample based on age or other demographics. You are attempting to make...
