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Answer: Ice Cream and Murder

The confounding variable in this case is hot weather. Hot weather is associated with ice cream consumption, and hot weather is associated with high murder rates, so in the original study it makes it look like eating ice cream and murder rates are associated, but the confounding factor, hot weather, is the more likely explanation.

Hot Weather and Violent Crime
A link with information, including graphs, of temperature and violent crime rates. Check out the "Psychological Explanation" link at the bottom of the page for experiments that have been done on this phenomenon.