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Unformatted text preview: Chapter 13 Notes Examples Page 1 of 4 Illustration of 689599.7 Rule 4321 1 2 3 4 34% 34% 13.5% 13.5% 2.35% 2.35% 0.15% 0.15% Chapter 13 Notes Examples Page 2 of 4 Example If the scores on a test have a symmetric distribution with a mean of 78.4 and a standard deviation of 9.6, within what interval would approximately 95% of the scores fall? 95% of data between s x 2 78.4 2(9.6) 78.4 19.2 (59.2, 97.6) Approximately what percentage of scores will be greater than 68.8? 34% + 50% = 84% Question We have the IQ test scores of all seventh graders in a rural Midwest school (n = 74). The distribution of the scores is approximately normal with a mean of 111 and a standard deviation of 11 (A stemplot of these scores is given in figure 13.13 on page 281). Using the 689599.7 rule, Between what values do the IQ scores of 95% of all rural Midwest seventh graders lie? A. (100,122) B. (89, 133) C. (78, 144) Example We have the IQ test scores of all seventh graders in a rural Midwest school (n = 74). We have the IQ test scores of all seventh graders in a rural Midwest school (n = 74)....
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This note was uploaded on 02/14/2011 for the course STAT 110 taught by Professor Johnson during the Fall '07 term at South Carolina.
 Fall '07
 JOHNSON
 Statistics

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