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.
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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