Stats 151 - Predicting Outcomes with Probability

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Chemistry 101 Stats 151 Flashcards on Stats 151 - Predicting Outcomes with Probability, created by jennabarnes12387 on 01/20/2014.

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Question Answer
What is probability? it is the odds of something happening that is used after you have collected and explored data. It is part of the inference step before we start to compare and find relationships between data sets.
how do we write a probability statement? P(experiment) = probability
What is the probability of an event? a number between 0 and 1 that predicts how likely it is for an outcome to occur
What is a random experiment? an experiment where the outcome is uncertain
What is a trial? a single performance of an experiment
what is an outcome? the results of a single trial
What is a sample space (S)? the set of all possible outcomes for a random experiment
what is an event? a subset of outcomes from the sample space (S)
what is a simple event? data from a single outcome e.g. the odds of rolling a 4 on a die
What is a compound event? data from more then one outcome e.g. the odds of rolling an even number on a die
What is a Venn diagram? a graph representing sample space that consists of a rectangle for the sample space and dots inside it representing the outcomes
What is a tree diagram? a visual graph that shows all possible outcomes. e.g. if a bag has 6 balls, 2 white, 2 red, and 2 green, you would show all possible combinations by drawig one ball of each color to represent the possibilities for the first picking and one bll of each color stemming off of each original drawing to represent the possibilities for the second pick = 9 possible choices
how do you find the probability of an outcome? Pi = P(Ei)
What are the conditions for probabilities? the number must be between 0 and 1 and the Pi must be greater then or equal to 1
What does the number between 0 and 1 mean? if it is close to zero the even will rarely happen, if it is close to 1 it will happen often. if it is 1 it will always happen and if it is 0 it will never happen.
How do you assign probability if the likelihood of all outcomes are equal? P(A) = # of outcomes in A / # of outcomes in S = # outcomes in A / N
How do you assign probability if the likelihood of all outcomes are not equal? just use the relative frequency
What does AUB stand for? either A or B or both can occur
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