# Stats Test 2 Prep

 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