Correlation vs Causation
Two variables rise and fall together: predict whether one causes the other, then reveal the hidden third variable driving both.
Type I & Type II Errors
Drag the significance threshold and the effect size across two overlapping worlds and watch false positives, false negatives and power trade off.
Chart Chooser
Pick the right chart for the data against the clock (line, bar, pie or scatter), then spot what's wrong with a chart: no title, no axis titles, no legend, or the wrong type.
Critical Path
Build a project from tasks and dependencies, see its Gantt chart and network, find the critical path and float, and test what a delay does.
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