AP Statistics Notes Chapter 6 - Discrete, Binomial, and Geometric Random Variables

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22 Terms

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probability of success
The ________- call it p- remains the same for each observation.
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probability distribution of X
The ________ lists the values and their probabilities.
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variable of interest
The ________ is the number of trials required to obtain the first success.
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pk The probabilities pi must satisfy two requirements
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6.3
The Binomial Distributions A binomial probability distribution occurs when the following requirements are met
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Each observation falls into one of just two categories
call them "success" or "failure."
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The procedure has a fixed number of trials
we call this value n. 3
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The observations must be independent
result of one does not affect another
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The probability of success
call it p -remains the same for each observation
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Notation for binomial probability distribution n denotes the number of fixed trials k denotes the number of successes in the n trials p denotes the probability of success 1
p denotes the probability of failure
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binomcdf(n, p, k)
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P(X  3) = 1
binomcdf(4, .8, 3)
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1
binomcdf(n, p, k -1)
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For n = 4, p = .8,   (4)(.8)  3.2 , which means we expect 3.2 makes out of 4 shots, on average 6.3
The Geometric Distributions A geometric probability distribution occurs when the following requirements are met
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Each observation falls into one of just two categories
call them "success" or "failure."
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The observations must be independent
result of one does not affect another
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The probability of success
call it p -remains the same for each observation
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As such, the geometric is also called a "waiting-time" distribution Notation for geometric probability distribution n denotes the number of trials required to obtain the first success p denotes the probability of success 1
p denotes the probability of failure
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1
geometcdf(p, n)
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P(X  3) = 1
geometcdf(.8, 3)
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1
geometcdf(p, n-1)
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P(X  3)= 1
geometcdf( .8, 2) Mean (expected value) of a Geometric Random Variable