M119L07to08-page2

M119L07to08-page2 - The mean and SD for Class 1 are: μ 1 =...

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(Lesson 7: Measures of Relative Standing or Position; 3-4) 3.31 z Score Rule of Thumb for “Unusual” Data Values Data values whose corresponding z scores are either less than ± 2 or greater than 2 (i.e., z < ± 2 or z > 2 ) are often considered “unusual.” In other words, data values that are more than 2 SDs from the mean are often considered “unusual.” Think About It : How would you feel if your instructor tells you that your z score for the test you just took was ± 2.31 ? Example Two statistics classes take different tests.
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Unformatted text preview: The mean and SD for Class 1 are: μ 1 = 55 points , ± 1 = 5 points . The mean and SD for Class 2 are: 2 = 60 points , 2 = 10 points . In which class is a score of 70 points more impressive? Solution Find the corresponding z scores for 70 points in the two classes. Class 1: Class 2: z = 70 ± 55 5 = 3.00 z = 70 ± 60 10 = 1.00 A score of 70 points is more impressive in Class 1; in fact, it is “unusually” high in that class....
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This note was uploaded on 12/29/2011 for the course MATH 119 taught by Professor Kim during the Fall '09 term at SUNY Stony Brook.

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