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Probability Models (Biostatistics)
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Terms in this set (12)
Probability Models
used to generate probabilities
Binomial distribution
two results...successes vs. failures use for discrete outcomes
P( x sucesses)=
n!/x!(n-x)! x p*x (1-p)ⁿ⁻*
x=7 n=10 p=.80
10!/7!(10-7)! x (.8)⁷ x (1-.8) ¹⁰⁻⁷ = .2013
The Normal Distribution
use for continuous outcomes
1 sd from the mean
68%
2 sd from the mean
95%
3 sd from the mean
99.9%
Normal Distribution formula...
z= x-u/sd use when there is a deviation from the mean.. gives the z score.... use the table to find the %
Pecentiles are
...
Central Limit Therorem
used when the population is large,
or when the mean and sd is given and the population size is large
Central Limit Theorem Formula
test mean-other mean/sd/squareroot of 40
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