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1.
2. “689599.7 Rule” (Empirical Rule)
(Empirical Empirical Rule
Empirical About 68% of observations fall within one standard
About
deviation of the mean
deviation About 95% of observations fall within two standard
About
deviations of the mean
deviations About 99.7% of observations fall within three standard
About
deviations of the mean
deviations Empirical Rule on the Curve
Empirical N(490, 100) Empirical Rule Demonstration http://www.stat.tamu.edu/~west/applets/empiric
http://www.stat.tamu.edu/~west/applets/empiric
alrule.html Empirical Rule Example
Empirical The scores for all high school seniors taking the
The verbal section of the Scholastic Aptitude Test
(SAT) in a particular year had a mean of 490 and
a standard deviation of 100. The distribution of
SAT scores is bellshaped. What percentage of seniors scored between 390 and
What
590 on this SAT test?
590 A rather exclusive university only admits students who
rather
were among the highest 16% of the scores on this test.
What score would a student need on this test to be
qualified for admittance to this university?
qualified Empirical Rule Examp...
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 Winter '13
 Jessell
 Normal Distribution

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