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Stat 1124: CH 3
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What is a density function?
A smooth curve drawn over the histogram is a mathematical model aka ia density function
What does a smooth curve describe?(aka density curve)
It describes the overall pattern of a distribution
What shapes do density curves come in?
They come in any imaginable shape!
What are some properties of density curves?
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)
What are three characteristics of normal distrubution?
What is the Emprircal rule?
68-95-99.7
How to calculate the area under the normal curve?
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".
When x is larger than the mean, z-score is ______
POSITIVE
WHen x is smaller than the mean, z-score is ________-
Negative
How to calculate z-scores (Just look)
Author:
lindaphann
ID:
128374
Card Set:
Stat 1124: CH 3
Updated:
2012-01-17T08:04:53Z
Folders:
Description:
Chapter 3: The Normal Distributions
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