Final answer:
Sally is affected by confirmation bias, as she ignores negative customer reviews and focuses only on the positive ones due to her personal liking for the product, giving her boss incorrect information.
Step-by-step explanation:
The decision making bias affecting Sally is known as the confirmation bias. This cognitive bias is characterized by the tendency to search for, interpret, favor, and recall information that confirms one's pre-existing beliefs or hypotheses. In Sally's case, her personal positive experience with the new style of coffee maker leads her to focus on the good reviews and ignore the negative ones, resulting in her providing incorrect information to her boss. Confirmation bias can significantly distort the accuracy of decision making because it leads to disregarding information that contradicts one's beliefs, despite its potential relevance or truth.