Final answer:
Rosenthal and Jacobson's study found that elevated expectations from teachers had a significant impact on the IQ scores of first-grade students.
Step-by-step explanation:
The study conducted by Rosenthal and Jacobson in 1968 found that the elevated expectations from teachers had a significant impact on the IQ scores of randomly selected first-grade students. These students experienced a spurt in IQ scores largely as a result of their teachers' expectations. The study suggested that when teachers have higher expectations for their students, it can positively influence their academic performance.