Homework: Section 3.2 Homework Score: 0 of 1 pt 3.2.33 5 of 84 An IQ test has a

Question

Homework: Section 3.2 Homework Score: 0 of 1 pt 3.2.33 5 of 84 An IQ test has a mean of 109 and a standard deviation of 15. Which is more unusual, an IQ of 139 or an 1Q of 67? O A. An IQ of 67 is more unusual because its corresponding z-score, is further from 0 than the corresponding z-score offor an 1Q of 139 Type integers or decimals rounded to two decimal places as needed.) An l Type integers or decimals rounded to two decimal places as needed.) B. of 130 s more unusual because its corresponding z-score is further f omthan the corresponding z-score of for an IQ of 67

Explanation / Answer

Mean = 109

Standard deviation = 15

Find Z score of X = 139, 67

AT X = 139

Z = (X - ) /
Z = (139 - 109) / 15

Z = 2

AT X = 67

Z = (X - ) /
Z = (67 - 109) / 15

Z = -2.8

A)

An IQ of 67 is more unusual because of its corresponding Z score -2.8 is further from o than the corresponding Z-score of 2 for an IQ of 137

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