Psychology in Modules
Psychology in Modules
11th Edition
ISBN: 9781464167522
Author: David G. Myers, C. Nathan DeWall
Publisher: Worth Publishers
Question
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Chapter 30, Problem 5TYS
Summary Introduction

Concept Introduction: Intelligent quotient (IQ) was derived by German psychologist William Stern. IQ is used as a method to assess intelligence. IQ is the ratio of a person’s mental age to a person’s chronological age and multiplied by 100.

Expert Solution & Answer
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Answer to Problem 5TYS

Correct answer:  The IQ of a 6-year-old with the measured mental age of 9 would be 150. Therefore, option d. is correct

Explanation of Solution

Reasons for the correct statement:

The formula for IQ is as follows:

mentalagechronologicalage×100

The given information:

Mental age = 9 years

Chronological age = 6 years

IQ=96×100=9006=150

Option d. is given as “150”

As IQ of a 6-year-old with the measured mental age of 9 would be 150, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “67”.

IQ of a 6-year-old with the measured mental age of 9 would be 150, not 67. So, option a. is incorrect.

Option b. is given as “133”.

IQ of a 6-year-old with the measured mental age of 9 would be 150, not 133. So, option b. is incorrect.

Option c. is given as “86”.

IQ of a 6-year-old with the measured mental age of 9 would be 150, not 86. So, option c. is incorrect.

Hence, options a., b., and c. are incorrect.

Conclusion
IQ is used as a method to assess the intelligence of an individual.

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Chapter 30 Solutions

Psychology in Modules

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