Which method assumes that measurements before the cause of the problem will be normal and measurements after will not be normal?

The half-split method is a diagnostic approach used in the context of identifying problems or anomalies in a system by analyzing data collected before and after a specific event or change. This method operates under the assumption that measurements taken prior to the event (the cause of the problem) will fall within a normal range, reflecting the system's typical behavior. Conversely, it posits that measurements taken after the event are likely to deviate from this normality, indicating the presence of an issue or anomaly triggered by the event itself.

This approach is particularly useful in contexts where a clear demarcation can be identified between 'normal' conditions and those influenced by an incident or change. By comparing the two sets of data, one can more easily isolate the effects of the identified cause, allowing for a better understanding of the impact on the system as a whole.

In contrast, methods like full-split may involve an analysis of both segments before and after without focusing on the assumption of normality, while normal distribution pertains specifically to the statistical representation of data rather than diagnostic methods. Statistical inference, on the other hand, involves using statistics to make generalizations or predictions about a population based on sample data but does not specifically address the comparative analysis between pre- and post-event