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Which of the following alternatives is correct for the Assertion and Reasoning statements ?

Assertion (A) : DIQs as measure of intelligence are preferred over IQs.
Reason (R) : To overcome the decimal fractions in IQ values DIQs are used.

  • A.(A) is true and (R) is also true, but (R) is not the correct reason of (A)
  • B.(A) is true and (R) is also true, and (R) is the correct reason of (A).
  • C.(A) is false and (R) is true
  • D.(A) is true and (R) is false

Answer: D

(A) is true and (R) is false.

Deviation IQs are preferred over ratio IQs. A ratio IQ, mental age divided by chronological age times 100, breaks down for adults, whose mental age stops rising, and its spread differs from age to age, so the same IQ means different things at different ages. A deviation IQ, introduced by Wechsler, is a standard score (mean 100, standard deviation 15) based on the person's own age group, so it means the same at every age.

The reason given is wrong: multiplying by 100 already removed decimal fractions from ratio IQs, and that is not why DIQs were adopted. So the options calling R true are wrong.

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