AP PSYCHOLOGY

Detailed explanation-1: -An 8-year-old who responded to the original Stanford-Binet with the proficiency of an average 10-year-old was said to have an IQ of: Response: 125. The first modern test of intelligence was developed in: Response: France.

Detailed explanation-2: -It consisted of 30 tests arranged in order of increasing difficulty. From the average scores of children, Binet developed the concept of mental age. On this test, children were assigned a score that corresponded to their mental age, which was the average of children taking the test who achieved the same score.

Detailed explanation-3: -Stanford-Binet Intelligence Scale It remains a popular assessment tool today, despite going through a number of revisions over the years since its inception. The IQ score was calculated by dividing the test taker’s mental age by their chronological age, then multiplying this number by 100.

Detailed explanation-4: -From Binet’s work, the phrase “intelligence quotient, ” or “IQ, ” entered the vocabulary. The IQ is the ratio of “mental age” to chronological age, with 100 being average. So, an 8 year old who passes the 10 year-old’s test would have an IQ of 10/8 x 100, or 125.