OSHA workplace inspectionsLawnmower-related deaths in the US
It turns out that the more carefully the government inspects workplaces for safety violations, the fewer people die while mowing their lawns, which is a sentence that contains no logical connectors whatsoever and yet here we are, staring at a 91% negative correlation as though the universe has decided to play a practical joke involving bureaucratic forms and grass maintenance. One wonders if OSHA inspectors have been secretly patrolling suburban gardens after hours, armed with clipboards and the kind of stern expressions that make recreational mowing seem inadvisable.
OSHA inspections dropped sharply in 2020 because inspectors weren't being sent into closed workplaces, while lawnmower-related deaths crept up as locked-down Americans spent more hours on their own lawns than ever before. One series measures a bureaucracy standing still; the other measures what people did in the yard while it was.
What we are witnessing is not correlation but the ghost of a third variable, the invisible hand that moves both OSHA compliance and lawnmower fatality rates like pieces on a board game nobody quite understands. The real lesson is that humans will find patterns in anything—we are, in essence, meaning-making machines malfunctioning in the dark, and sometimes we catch ourselves holding two unrelated datasets and insisting they must be dancing together. But they were only ever standing near each other.
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Want to learn more about why correlations like “OSHA workplace inspections” vs “Lawnmower-related deaths in the US” don't prove causation? Read our guide to statistical thinking.