What term is used to describe a decision based solely on incomplete data points?

The term that describes a decision made based solely on incomplete data points is known as hasty generalization. This occurs when a conclusion is drawn from an insufficient or biased sample, leading to a statistically invalid or misleading inference. In essence, it involves making broad conclusions based on limited evidence, which can result in stereotypes or sweeping assumptions that do not accurately reflect the larger situation or population.

For example, if someone observes behavior from a few individuals and uses that to make a general statement about an entire group, that would be a hasty generalization. The critical aspect here is the reliance on inadequate data for making conclusions, which is why the term is so relevant in discussions surrounding logical fallacies and reasoning errors.