First, separate them into homogenous units and then randomly select representative samples from each unit.
Heterogeneous population and sampling
In order to sample a heterogenous population or material and we want the sample to be representative of the population or material:
- The material should first be separated into homogenous units
- Each unit can then be randomly sampled or any other sampling method that is unbiased
More on heterogeneous populations can be found here: https://brainly.com/question/1068437?referrer=searchResults
