Page 388 - DEDU504_EDUCATIONAL_MEASUREMENT_AND_EVALUATION_ENGLISH

Educational Measurement and Evaluation

Notes 4 months. Later, the months are also transformed into years. For example, 6 years and 4 months
Mean years = = years.

32.4.6 Mental Age
In the context of intelligence test, the mental age of a child or person shows the extent of intelligence
development. If a child is able to perform such mental activities properly which are found suitable
for his chronological age, it is considered that his mental age is equal to his chronological age. And
if the child is able to perform some of the mental activities determined for the children above his
age, correctly than his mental age will be more than his chronological age. On the other hand, if he
is not able to perform the activities determined for his age, correctly, his mental age will be less than
his chronological age. For example, if an 8-year old child is able to perform the activities determined
for the common children of his age, correctly, his mental age will be 8 years. If he is also able to
perform the mental activities meant for 10-year old children, his mental age will be considered to be
10 years. On the other hand, if he is not able to perform the mental activities meant for his own age,
but is able to perform only the activities meant for 6-year old children, his mental age will be
considered to be only 6 years.
The year for which a child performs all activities determined for that age, correctly is called the
basal year in the context of intelligence test. After this, the number of months are credited to his
mental age equivalent to the number of activities he is able to perform determined for above that
age. In the context of intelligence test, it is called credit age. And the year for which he is not able
to answer any of the questions, is called the terminal year. It is evident that the mental age of a
person is obtained using an intelligence test, as follows :
Mental age = Basal year + Credit Age
Like chronological age, mental age is also calculated in years and months, and its calculation is done
exactly in that form as is done for chronological age. For example, the meaning of mental age at 8

years 2 months will be years = = years.

32.4.7 Intelligence Quotient and Deviation Intelligence Quotient

Generally, the measurement of intelligence of a child or person is done in the form of intelligence
quotient, but in some tests, it is also done in the form of deviation Intelligence quotient. Before
proceeding further, it should he prudent to understand their meaning.

Intelligence Quotient
By intelligence quotient is meant the ratio of mental age and chronological age of a child or person.
To remove the decimal point from this ratio, it is multiplied by 100. Thus,

Intelligence quotient =
It is written in brief as :
I.Q. =

Deviation Intelligence Quotient
Intelligence quotient is found out as a ratio of mental age and chronological age. Because the
development of intelligence is generally complete by the age of 16 years, so the chronological age
for persons above 16 years of age is also considered to be 16 years. Therefore, is the development of
a person’s intelligence is completed before 16 years of age or it is completed after it by one, two or
four years, error in measurement of intelligence quotient is natural. Again, it is now accepted that
the intelligence of a person continues to develop under certain circumstances. As a result, the
intelligence quotient as measured at a particular time cannot be considered to be the correct

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