ITPEC FE Morning October 2022 Question 77
ITPEC FE Morning October 2022 — Question 77 of 80
The Z chart (Z graph) is named for the visual shape formed by its three data lines plotted over a fixed period (typically one year):
1. Monthly figures — individual period values (bars or line)
2. Cumulative total — running sum from the start of the period
3. Moving annual total — sum of the last 12 months, rolled forward each month
These three lines together form a "Z" shape, making it easy to spot trends, seasonality, and overall direction at a glance.
Why not others:
- (a) "Pie intersection chart" is not a recognized standard chart type.
- (b) Radar chart (spider chart) compares multiple variables across categories — not designed for time-series with cumulative tracking.
- (c) SD chart is a statistical process control chart tracking standard deviation — used in quality management, not business performance over time.
Key rule: Z chart = three simultaneous lines (monthly + cumulative + moving total) that visually form the letter "Z".
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