Which of the following is a set of constitutional isomers? 
Definitions:
Null Hypothesis
A statement in hypothesis testing that assumes no significant difference or effect exists between certain measured phenomena or populations.
Directional
Pertaining to a hypothesis or test that specifies the expected direction of the relationship between variables.
Variability
The extent to which data points in a dataset differ from each other.
Sampling Distribution
The probability distribution of a given statistic based on a random sample.
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