CEVAP:

A well-defined quantitative research problem has to bear some certain features.
First, the variables in the problem have to explain a relation. Second, it has to be formulated as question. Accordingly, formulas such as “Is there a relation …?”, “What is the effect of …?”, and “Does it change …?” can be employed to construct a question for a research problem. Third, a research problem has to be suitable for analysis based on collected data, or it has to be testable.