Probability
Researchers are attempting a process that succeeds 20% of the time. What is the probability their first success will occur on the 6th try?
geometpdf(p = .2, X = 6) = .066
A binomial trial has what number of possible outcomes?
Two (success or failure)
Binomial random variables are
A) discrete B) continuous C) can be either
A) discrete
Drake and Rick Ross - Money in the Grave
Researchers are attempting a process that succeeds 20% of the time. If they attempt it 10 times, what is the probability they succeed exactly 3 times?
binompdf(n = 10, p = .2, X = 3) = .201
A player makes 40% of their free throws. How many would we expect them to take before they make their first one?
1/p = 1/.4 = 2.5
A geometric trial has what number of possible outcomes?
Two (success or failure)
Geometric random variables are
A) discrete B) continuous C) can be either
A) discrete
2023
Dua Lipa - Houdini
A student is able to guess correctly on a test question 35% of the time. If the test has 8 questions, find the probability they will get at least 4 questions correct?
1 - P(at most 3) = 1 - binomcdf(n = 8, p = .35, X = 3) = 1 - .706 = .294
Trials for binomial or geometric variables have to be
A) dependent B) independent C) can be either
The probability of success on that try can change between each individual try for binomial and geometric; True or false
False
2012
A student is able to guess correctly on a test question 35% of the time. What is the probability it takes them more than 4 questions to get their first question correct?
1 - P(at most 4) = 1 - geometcdf(p = .35, X = 4) = 1 - .821 = .179
What does a binomial random variable have that geometric does not?
Fixed number of trials