Question

Who devised the concept of Intelligence Quotient (IQ)?

• A. Alfred Binet
• B. Theodore Simon
• C. William Stern
• D. Lewis Terman

Answer 1

The Correct Option is C

The concept of the Intelligence Quotient (IQ) was devised by William Stern. In psychology, the IQ is a measure derived from the standardized testing of cognitive abilities and is used to assess an individual's intellectual capabilities in relation to the average performance of a population.

William Stern, a German psychologist, introduced the IQ as a ratio of mental age to chronological age, multiplied by 100. This formula allowed for the comparison of intellectual performance across different age groups: 

IQ Formula
\( IQ = \frac{Mental\:Age}{Chronological\:Age} \times 100 \)

Stern's work was critical in shaping the quantitative evaluation of intelligence, leading to further developments and refinements by other psychologists, such as Alfred Binet and Lewis Terman, who contributed to the evolution of IQ testing methods.

Answer 2

The concept of Intelligence Quotient (IQ) was devised by William Stern in the early 20th century. He defined IQ as the ratio of mental age to chronological age, multiplied by 100. Although Alfred Binet and Theodore Simon developed the first standardized intelligence test, it was Stern who introduced the term “Intelligence Quotient” to quantify intellectual performance. Stern's formula allowed for a more standardized way to assess and compare intelligence across individuals.