Concept:
Research design is the overall plan or framework used to conduct a research study systematically.
Step 1:
Research design explains what the researcher wants to study and the method used for conducting the study.
Step 2:
It helps organize data collection, sampling, analysis, and interpretation in a structured manner.
Step 3:
A hypothesis is only a tentative statement or assumption, not the complete plan of study.
Step 4:
• Summary is a brief conclusion of information.
• Speculation means assumption without evidence.
Step 5:
Hence, the correct answer is Research Design.
\[
\boxed{\text{(4) Research Design}}
\]