What fallacy is illustrated by concluding that all Mars candy bars are dangerous because six out of twelve were tested as such?

The conclusion that all Mars candy bars are dangerous based on the testing of just six out of twelve exemplifies the hasty generalization fallacy. This fallacy occurs when a conclusion is drawn from an insufficient sample size or insufficient evidence. In this case, determining that all Mars candy bars pose a danger because a portion of them tested as such does not account for the entire population of Mars candy bars. Such reasoning lacks adequate representation and overlooks the potential for variability in quality and safety in the larger group. It therefore leads to an inaccurate broad claim based on limited observations.