Scientists generate a hypothesis before conducting research primarily because it helps shape the parameters of the study by predicting a result. A hypothesis serves as a testable statement that can guide the research design, data collection, and analysis. By formulating a hypothesis, scientists can focus their efforts on specific questions and predictions, providing a framework for interpreting the collected data.
While a hypothesis does help provide a framework for interpretation and can inform decisions about what data to collect, it doesn't inherently provide a result before experimentation and is not meant to guide which data to ignore. The purpose of a hypothesis is to create a foundation for inquiry rather than to limit the scope of the investigation.