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What is the normal distribution?
A family of curves, each defined by the standard deviation and mean (σ+µ)
The differences are measured as standard deviations
Why do the measures of central tendency all have the same value on the normal distribution?
It is symmetrical, no matter the parameters, the normal distribution preserves its perfect bell shape
Different variances make it wider, different means make it shift in their direction
What is the standard normal distribution?
A type of standard distribution curve with a mean of 0
Values on this curve are known as z scores
What is suggested by the central limit theorem?
Many naturally occurring variables will tend to fall close to the normal distribution
How might one use a normal distribution curve to find the probability of an eventuality over a specific point?
Draw a vertical line on the curve at the point
Give the equation for converting a normal score into a z score
This is the same formula for generating standard scores
What are scores to the right and to the left of the z score referred to as?
P(z) for right
1-P(z) for left
How might one find the area between two values?
Find the score for the highest value given
Find the score for the lowest value given
Minus one by the other
Eg:
P(z<+.67)=.749
P(z< -.67)=.251
P(-.67<z<+.67)=.749-.251=.498
Author
camturnbull
ID
287141
Card Set
Stats 10
Description
BSc Stats
Updated
2014-10-26T22:21:58Z
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