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Statistics / Elementary Statistics 12 / Chapter 3.4 / Problem 9BSC

Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola

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Usual and Unusual Values. In Exercises, consider a value

Chapter 3, Problem 9BSC

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Problem 9BSC

Usual and Unusual Values. In Exercises, consider a value to be unusual if its z score is less than −2 or greater than 2.

IQ Scores The Wechsler Adult Intelligence Scale measures IQ scores with a test designed so that the mean is 100 and the standard deviation is 15. Consider the group of IQ scores that are unusual. What are the z scores that separate the unusual IQ scores from those that are usual? What are the IQ scores that separate the unusual IQ scores from those that are usual?

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QUESTION:

Problem 9BSC

Usual and Unusual Values. In Exercises, consider a value to be unusual if its z score is less than −2 or greater than 2.

IQ Scores The Wechsler Adult Intelligence Scale measures IQ scores with a test designed so that the mean is 100 and the standard deviation is 15. Consider the group of IQ scores that are unusual. What are the z scores that separate the unusual IQ scores from those that are usual? What are the IQ scores that separate the unusual IQ scores from those that are usual?

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