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Published byAnna Holland Modified over 8 years ago
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Bell Ringer Using all available resources (especially your brain), answer the following: 1. What is normal? 2. What are the three measures of central tendency? 3. What are outliers? 4. What does deviate mean?
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Normal Distribution Wednesday, April 20, 2016
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How can data be distributed? One very important type of data distribution is called “ normal distribution.” So what is “ normal ”? Let’s see…
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What is “normal”?
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Characteristics of “normal distribution”? 1. The mean, median, and mode are all the same. 2. The data fits a “bell curve”. 3. The inflection points are equidistant from the mean (we call this distance standard deviation). 4. Then mean is represented by the Greek letter mu μ 5. Standard deviation is represented by the Greek letter sigma σ 6. Approximately 68% of your data is within 1 standard deviation of the mean. 7. Approximately 95% of your data is within 2 standard deviations of the mean. 8. Approximately 99.7% (so almost all) of your data is within 3 standard deviations of the mean.
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What does standard deviation tell us about a distribution?
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What does the mean tell us about a distribution?
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Notes – Empirical Rule sheet Homework – Empirical Rule and Normal Distribution
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Exit Ticket What is the Empirical Rule?
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