Here, we want to identify if the situation would provide a random or biased sample
To ensure a proper identification, we need to understand the technical terms involved which are the random sample and biased sample.
The difference between the two is the systematic way of sampling.
If the samples to be used are selected randomly without any of them being systematically likely to be selected than the other, then we have a random sampling. Otherwise, what we have is a biased sample. Hence, a biased sample is one in which the values selected from the population are as a result of some samples being more systematically favored to be selected.
Looking at the question, we can conclude that the sampling is a random sample. This is because lots of counties were taken into consideration from each representative section of Kentucky.
All three senatorial districts contribute the measure of rainfall in several counties within their jusridiction