# Stat 1124: CH 3

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 Author: lindaphann ID: 128374 Filename: Stat 1124: CH 3 Updated: 2012-01-17 03:04:53 Tags: Stat 1124 Folders: Description: Chapter 3: The Normal Distributions Show Answers:

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1. What is a density function?
A smooth curve drawn over the histogram is a mathematical model aka ia density function
2. What does a smooth curve describe?(aka density curve)
It describes the overall pattern of a distribution
3. What shapes do density curves come in?
They come in any imaginable shape!
4. What are some properties of density curves?
5. What is Normal distributions?
Normal distrubutions are a family of symmetrical, bell shaped density curves defines by a mean (mu) and a standard deviation(sigma)
6. What are three characteristics of normal distrubution?
7. What is the Emprircal rule?
68-95-99.7
8. How to calculate the area under the normal curve?
9. What does a z-score measure?
A z-score measure the number of standard deviations that a data value x is from the mean "u".
10. When x is larger than the mean, z-score is ______
POSITIVE
11. WHen x is smaller than the mean, z-score is ________-
Negative
12. How to calculate z-scores (Just look)

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