Of the following groups of people, which would be most likely to have the highest standard deviation in scores of intelligence?

Psychology professors typically possess advanced degrees and share a similar educational background, resulting in a narrower range of intelligence scores. The homogeneity of their academic training and professional experience likely leads to a lower standard deviation in comparison to a more diverse population.

Airline pilots must meet stringent training and education requirements, which generally results in a more uniform level of intelligence among them. While there may be some variation, the professional standards create a more homogenous group, thus leading to a lower standard deviation in intelligence scores.

Gifted students are selected based on their high cognitive abilities, which typically means they fall within a narrower intelligence band. Since they are often grouped together based on similar exceptional capabilities, the standard deviation in intelligence scores is likely to be lower than that of a more diverse group.

Piano teachers may also exhibit a range of intelligence scores, but their shared expertise in music education tends to create a closer-knit group, resulting in a lower standard deviation compared to the broader population of residents in a large metropolitan area.