Final answer:
Louis Terman adapted Binet's intelligence test by standardizing it and norming it against a representative sample, developing the Stanford-Binet Intelligence Scale.
Step-by-step explanation:
When Louis Terman adapted Alfred Binet's intelligence test, he made a significant contribution to the field of psychology and to the practice of intelligence testing. Terman's primary change was to standardize the administration of the test and to test thousands of different-aged children to establish an average score for each age. This process of norming and standardizing the test means that it was administered consistently to a large enough representative sample of the population to produce a range of scores that resulted in a bell curve. Consequently, the Stanford-Binet Intelligence Scale, as it became known, provided reliable data and brought consistency to intelligence measurement, which greatly influenced the field.