Answer :
when you are interrogating the external validity of a sample, option(b). how was the sample collected? is the most important question to ask.
What is External validity?
The concept of external validity is related to the concept of generalization. It's imperative to keep that in mind. It is important to remember that validity refers to the approximate truth of a proposition, an inference, or a conclusion. In other words, external validity refers to the relative truth of generalizations based on generalizations. The external validity of your study is the degree to which the conclusions are applicable to other people, places, and times.
An external validity threat is an explanation of how a generalization could be flawed. A study you conducted in a particular place, with certain types of people, at a particular time, can be generalized to another context (for instance, another place, with slightly different people, at a slightly different time). External validity can be compromised in three ways: people, places, and times.
Question
When you are interrogating the external validity of a sample, which is the most important question to ask?
a. how many people are in the sample?
b. how was the sample collected?
c. how were the participants measured?
d. how many people are in the population?
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