# Stats Test 2 Prep

 The flashcards below were created by user ballinbc14 on FreezingBlue Flashcards. Situation in which the outcome is unknown before it happens...give example Random Experimentrolling die This is the most basic outcome of a random experiment (simple event)..give example Sample Pointhead or tail for a coin toss This is a collection of sample points Event This is a collection of all sample points in the experiment Sample space The probability of an event (or simple event) is simply what you think it is , so long as the values of probability are observed...give example Personal probabilityflipping a coin and peaking The probability of a (simple) event happening is the “long-run” relative frequency of that event Relative frequency interpretation In the event that both A and B occur at the same time it is called an... intersection The probability of either A or B happening is called a ? Union Give the 2 terms assigned for when two events CANNOT happen at the same time Mutually exclusivedisjoint What is the formula for (A u B) P(A)+P(B)-P(A n B) What is the formula for (A u B) if A and B are mutually exclusive..explain P(A)+P(B)-P(A n B)=P(A)+P(B)this is because A n B can't happen together What is the formula for conditional probability? (A|B) P(A n B)/P(B) In the formula for A|B can you calculate A n B directly? No, it must be either given or extrapolated from a different formula If knowledge of one event happening does not change the probability of the other one happening, the two events are said to be... independent What does this mean: A u B u C... probability of at least one of these events have happening What does this notation mean: A n B n C.. These events have all happened What does this mean: A u B n C Nothing..has no meaning...must know which one to do first What does this notation mean: (A u B) n C First the probability of the union of event A and B then the probability of the intersection of one of those with C Based on the distributive rule, what does this equal: A u (B n C) (A u B) n (A u C) Based on the distributive rule, what does this equal: A n (B u C) (A n B) u (A n C) This is a sample that represents our population well Representative sample If a sample is not representative of the entire population, it is called: biased What are the 3 types of sample bias? Response biasNon-response biasSampling bias What is a response bias..give example Measurement obtained that is incorrectlies in a surveybad scale What is a non-response bias?..give example Simply getting no response at allanything involving volunteer answersscale you can't use What is Selection bias?...give example Taking a sample that is not from your general populationWanting a survey of the UConn population but only surveying grad students How do you control sample bias by taking simple random samples A list of everything in your population is called a... population frame What is a convenience sample, and would it be a good representation? Simply sampling those around you at the timebad representation What is cluster sampling?...and is it a good representation Breaking the population into groups and taking simple random samples of each groupgood representation What is stratified sampling and how good of a representation is it? Breaking the population into different groups which have members with similar properties then doing SRSvery good representation This type of random variable can on a particular value Discrete random variable This type of random variable can take on any value in one or more intervals Continuous random variable Authorballinbc14 ID73617 Card SetStats Test 2 Prep DescriptionStat 1100Q preparation for test 2 Updated2011-03-18T06:12:27Z Show Answers