Final answer:
The question "does a full moon cause people to behave irrationally?" is not a good scientific question, as it is not easily testable with definitive evidence and is based on folklore rather than empirical data. The correct option is 3) does a full moon cause people to behave irrationally?
Step-by-step explanation:
Out of the options given, the question that is NOT an example of a good scientific question is "does a full moon cause people to behave irrationally?" This question introduces a claim that is not easily testable with definitive evidence and is rooted in folklore rather than empirical evidence.
In contrast, questions regarding obesity and life expectancy, dietary fat and breast cancer, and temperature effects on enzymatic reactions are all questions that can be investigated using the scientific method.
Good scientific questions are typically characterized by their testability through observation and experimentation, and by being falsifiable; that is, it must be possible to prove them false. Therefore, claims regarding factors such as the full moon influencing behavior tend to fall outside the scope of traditional scientific inquiry since they do not lend themselves well to controlled, replicable studies and often rely on subjective interpretation.
On the other hand, examining the health impacts of obesity, analyzing the correlation between diet and cancer, and studying the temperature sensitivity of enzyme activities are straightforward, testable hypotheses. Hence, 3 is the correct option.