Discussion
The advantage of cumulative sum analysis over comparing monthly figures is that it
Answer: B
Correct answer: accumulates small changes that monthly noise would hide
A cumulative sum adds up the differences between actual and expected consumption month by month, so a persistent small deviation builds into a visible trend while random scatter cancels. A change of a few per cent that no single month would reveal shows as a clear change of slope, and the month it began can be read off directly.
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