Stat 2004 Week 8: Z-Score and Normality
Stat 2004 Week 8: Z-Score and Normality STAT 2004
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This 1 page Class Notes was uploaded by Mara DePena on Sunday March 20, 2016. The Class Notes belongs to STAT 2004 at Virginia Polytechnic Institute and State University taught by Metzger in Spring 2016. Since its upload, it has received 13 views. For similar materials see Introductory Statistics in Statistics at Virginia Polytechnic Institute and State University.
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Date Created: 03/20/16
STAT 2004 WEEK 8 Z-SCORE PROBLEMS Z-score- How many standard deviations away from the mean the observation is. o Z= (observation – mean) / standard deviation o There is a chart that lists the z-scores, and using this chart you can determine the percentage of observations under the left part of the curve corresponding to that z-score. The steps to solving a problem involving z-score: o Start with an observation o Find the z-score(s) o Look up the corresponding probabilities in the chart “Less than”: Keep value from table “More than”: 100% - table value “Between”: Difference in table values. EVALUATING NORMALITY 68-95-99.7 (Empirical) Rule o For any normal distribution, one standard deviation away is 68%, two is 95%, and three is 99.7%.
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