Regardless of the type of observational technique used to measure behavior, the goal of any correlational study is to examine relationships between or more measures of behavior.

two  

Explanation:

In research methods, the correlational study is referred to as one of the different types of research designs or methods whereby a researcher attempts to understand the kind or type of relationships various naturally occurring "variables" possess with each other. In other words, a correlation study design attempts to figure-out in what way two or more than two variables are being related to each other.

According to the question above, the correct answer would be "two".

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