Though ice cream is an excellent source of calcium, dairy farmers report that during the past ten years there has been a sharp decline in ice cream sales. ███ ██████ ███ ████ ███████ █████ ██ ███████ ██████ ████ ██████ ████████ ██████████ ████ ███ ████ ██████ ████ ██ ████████ ██ ████████ █████ ██████ ██ ███████ ██ ██████ ███████ ██████ ██████ ████ ███ ██████
The author hypothesizes that more people are choosing to increase their calcium intake by eating cheddar cheese rather than ice cream. He supports this by pointing out that ice cream sales have sharply declined over the past ten years, while cheddar cheese sales have nearly doubled.
This is the cookie-cutter flaw of assuming that correlation proves causation. The author shows a correlation between a rise in cheese sales and a drop in ice cream sales, and then concludes that people turning to cheddar cheese for calcium is what caused these changes. But there could be other explanations for why people are buying less ice cream or why they’re buying more cheddar cheese.
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