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Variations in Psychological Attributes
What is IQ? How do psychologists classify people on the bases of their IQ scores?
(i) IQ is an index of brightness.
(ii) It is the ratio of mental age to chronological age.
(iii) The concept of IQ was given by William Stern who gave the formula to calculate IQ i.e.,
• If MA > CA Above average
MA < CA Below average
MA = CA Average
• IQ is relatively stable.
• Average IQ is 100.
• It is a good predictor of potential.
• IQ scores are distributed in a population in such a way that most people tend to fall in the middle range of the distribution.
• This can be shown in the form of following table.
Classification of People on the Basis of IQ
|
IQ Range |
Descriptive Label |
Per cent in the Population |
|
Above 130 |
Very superior |
2.2 |
|
120-130 |
Superior |
6.7 |
|
110-119 |
High average |
16.1 |
|
90-109 |
Average |
50.0 |
|
80-89 |
Low average |
16.1 |
|
70-79 |
Borderline |
6.7 |
|
Below 70 |
Mentally challenged/retarded |
2.2 |
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