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

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