Consider the following statements about the role of a hypothesis in historical research:

1. A hypothesis provides a guiding framework for the direction of historical inquiry.
2. Hypotheses in history are typically speculative and do not require verification through evidence.
3. Formulating a hypothesis helps in structuring historical research and selecting relevant sources.
4. Unlike scientific research, historical hypotheses are not falsifiable and cannot be tested against facts.

Which of the statements are correct?