Why did white collar workers have more time off than blue-collar workers? A. Their companies did not pay them for extra work time.
B. They could stop working when the boss went home.
C. They worked on machines that ran night and day.
D. They had better unions than unskilled blue-collar workers.

B. They could stop working when the boss went home.

Explanation:

The white-collar workforce may operate from behind a desk, while the working class person of blue-collar gets his hands dirty doing manual work or working in a manufacturing unit. White-collar jobs referred mostly to office jobs, so typically they end at a fixed time, on the other hand, blue-collar jobs are service-oriented which can be performed whenever needed, so they're not as flexible. Therefore, as most offices have fixed times, white-collar workforce could stop work when their bosses stop.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.