Letitia is a salesperson. she routinely sells at a lower volume than her colleagues. however, she offers excellent customer service after the sale, and customers routinely give positive feedback when asked to fill out survey. her supervisor routinely ranks her as either above average or superior on all items on her performance appraisal, including output. this is an example of error influencing an appraisal.

halo error

Explanation: In simple words, halo error refers to the mistake or bias that occur in the performance evaluation when someone evaluates other on the basis of their personal perception and not on the basis of the performance done by that individual.

In the given case, Letitia is evaluated above than others although she sells lesser volume than others. This happens due to the perception of her supervisor that customer service is more important.

answerpounds of plastic to purchase 200+60-20=(240);