plugin-Chapter 13b Students

# plugin-Chapter 13b Students - Normal Distributions CHAPTER...

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CHAPTER 13B Normal Distributions

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EXAMPLE 13.3 Heights of adults, ages 18-24 Men mean: 70.0 inches standard deviation: 2.8 inches So… 68% of men are between 67.2 and 72.8 inches 95% of men are between 64.4 and 75.6 inches 99.7% of men are between 61.6 and 78.4 inches
EXAMPLE 13.3 What proportion of men are less than 68 inches tall? ? 68 70 (height values) 0 1 -1 2 -2 3 -3 standard deviations: 70 72.8 67.2 75.6 64.4 78.4 61.6 height values:

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STANDARD SCORES & PERCENTILES The 68-95-99.7 rule helps us to find the percent of observations that fall within 1, 2, or 3 standard deviations of the mean. How do we find the percent above or below values from our data? We have to rely on the standard score and percentile method.
Observations expressed in standard deviations above or below the mean of a distribution are called standard scores. They are also called z- scores. The standard score for any observation is

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## This note was uploaded on 08/05/2011 for the course STA 200 taught by Professor Wierdhobbitguy during the Summer '08 term at Kentucky.

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plugin-Chapter 13b Students - Normal Distributions CHAPTER...

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