In an investigation that uses the scientific method, which step immediately follows making a hypothesis? summarizing the results asking a question making observations designing an experiment

designing an experiment

A hypothesis can be defined as the testable statement based on the scientific law or theory which needs to be proved by  appropriate experimental methodology.

According to the given situation, in an investigation that uses the scientific method, which needs to be followed immediately after making a testable hypothesis is designing an experiment, which includes choosing an appropriate technique for collecting a data, and methodology of experimental setup.

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