IQ scores are normally distributed with mean 100 and sd 15. Prathamesh wants to be a part of Mensa club but they admit only top 1% of high IQ people. How much IQ he need to have to be a part of this club. O a. 99.4 O b. 134.9 OC 124.9 od 114.9
Answers
Step-by-step explanation:
Introduction to IQ
IQ is a type of standard score that indicates how far above, or how far below, his/her peer group an individual stands in mental ability. The peer group score is an IQ of 100; this is obtained by applying the same test to huge numbers of people from all socio-economic strata of society, and taking the average.
The term 'IQ' was coined in 1912 by the psychologist William Stern in relation to the German term Intelligenzquotient. At that time, IQ was represented as a ratio of mental age to chronological age x 100. So, if an individual of 10 years of age had a mental age of 10, their IQ would be 100. However, if their mental age was greater than their chronological age (e.g., 12 rather than 10), their IQ would be 120. Similarly, if their mental age was lower than their chronological age, their IQ would be lower than 100.
When current IQ tests were developed, the average score of the norming sample was defined as IQ 100; and standard deviation (a statistical concept that describes average dispersion) up or down was defined as, for example, 16 or 24 IQ points greater or less than 100. Mensa admits individuals who score in the top 2% of the population, and they accept many different tests, as long as they have been standardised and normed, and approved by professional psychologists’ associations. Two of the most well-known IQ tests are 'Stanford-Binet' and 'Cattell' (explained in more detail below). In practice, qualifying for Mensa in the top 2% means scoring 132 or more in the Stanford-Binet test, or 148 or more in the Cattell equivalent.
Measuring Intelligence - Noteworthy Contributors
Sir Francis Galton
Sir Francis Galton was the first scientist who attempted to devise a modern test of intelligence in 1884. In his open laboratory, people could have the acuity of their vision and hearing measured, as well as their reaction times to different stimuli.
James McKeen Cattell
The world’s first mental test, created by James McKeen Cattell in 1890, consisted of similar tasks, almost all of them measuring the speed and accuracy of perception. It soon turned out, however, that such tasks cannot predict academic achievement; therefore, they are probably imperfect measures of anything we would call intelligence.
Alfred Binet
The first modern-day IQ test was created by Alfred Binet in 1905. Unlike Galton, he was not inspired by scientific inquiry. Rather, he had very practical implications in mind: to be able to identify children who cannot keep up with their peers in the educational system that had recently been made compulsory for all.
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