No calculator
A community garden records water use each quarter. The vertical measurements use kilolitres
State the overall direction shown across the full period
The overall level increases
The overall level decreases
The overall level is approximately constant
The level changes from decreasing to increasing
Decide whether the plot contains an isolated departure with a return to the nearby pattern
Yes, one observation departs and then returns to the nearby pattern
No, there is no single observation with that pattern
Which description best matches the departure near 2017 Q3?
One observation near 2017 Q3 departs from the nearby values and then returns
The shorter movements are unsystematic, with no single departure or lasting shift
The level changes from 2017 Q3 and stays at a new level afterwards
Select a possible source of the one-off departure; this does not prove its cause
a calendar-linked repeated pattern
a temporary change affecting one period
a lasting change in the process level