In an interrupted times-series study on the effect of a reduced speed limit, the change in the time graph must
A) be a sharp drop followed by a gradual increase back to the baseline to be interpreted as anything other than normal fluctuation.
B) be slight or gradual at the time of the "interruption" to be interpreted as anything but normal fluctuation.
C) be quite sharp at the time of the "interruption" to be interpreted as anything other than normal fluctuation.
D) be a sharp increase followed by a sharp decrease to be interpreted as anything but normal fluctuation.
Answer: C
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