What is an essential skill when conducting a scientific investigation?

Formulating a hypothesis is a fundamental step in scientific investigation because it provides a clear, testable statement that predicts the relationship between variables. A hypothesis guides the research process by establishing what the investigator is trying to prove or disprove. It sets the direction for the investigation, helping to focus experimental design and determine how to collect and analyze data effectively. In essence, the hypothesis is a crucial building block of the scientific method, as it not only frames the research question but also lays the groundwork for experimentation and subsequent conclusions.