# Stats 151 - Predicting Outcomes with Probability

Flashcards by jennabarnes12387, updated more than 1 year ago
 Created by jennabarnes12387 about 7 years ago
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### Description

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

## Resource summary

 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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