What is the correct structure for 3-phenylpropanal? 
Definitions:
Observed Data
Refers to the data that has been collected or measured directly in an experiment or study.
Calculated
Determined or derived by mathematical methods or processes.
Null Hypothesis
A default hypothesis that there is no effect or no difference, used as a basis for statistical testing.
Research Hypothesis
A specific, testable prediction about the expected outcome of a study based on theory or prior research.
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