IQ scores are measured with a test designed so that the mean is 120 and the standard deviation is 12. 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? (Consider a value to be unusual if its z score is less than minus2 or greater than 2.) What are the IQ scores that separate the unusual IQ scores from those that are usual?

Question

Mathematics

Diya Snow

14 January, 09:20

IQ scores are measured with a test designed so that the mean is 120 and the standard deviation is 12. 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? (Consider a value to be unusual if its z score is less than minus2 or greater than 2.) What are the IQ scores that separate the unusual IQ scores from those that are usual?

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Tess Lambert · Answer 1

Step-by-step explanation:

Here a score is considered to be "unusual" if higher than 2 std. dev. from the mean OR lower than 2 std. dev. from the mean.

Thus, any score lower than (120 - 2[12]), or 96, or higher than (120 + 2[12]), or 144, is considered to be "unusual."