When can researchers obtain accurate results from a small sample? o when the population being studied is heterogeneous o when the population being studied has little variability o when the sample is heterogeneous o when the sample has little variability

When the population being studied has little variability

Explanation:

Usually, any population has too many persons to perform a convenient study, so there is usually a restriction in investigations of a set of samples that come from it. An optimal sample will contain the majority of the information about a specific population, but the connection between the sample and the population has to be appropriate enough to make the sample valid. This is why the population should have little variability.