Statistics S1 Quiz Revision Quiz for S1 Statistics+ 4.5 / 5 based on 18 ratings ? MathematicsStatistics, averages and distributionsASAll boards Created by: Yvonne AndrewsCreated on: 16-01-12 10:26 A Mathematical Model is a simplification of a real world situation 1 of 18 One disadvantage of a mathematical model is they only work for a restricted set of variables 2 of 18 When using coding the mean must be uncoded completely 3 of 18 Standard deviation is uncoded by multiplying or dividing only 4 of 18 mode>median>mean means that the distribution is negatively skewed 5 of 18 If Q2-Q1<Q3-Q2 then the distribution is positively skewed 6 of 18 For a histogram data needs to be continuous 7 of 18 A tree diagram shows probability of events 8 of 18 Mutually Exclusive events have no outcomes in common 9 of 18 Events are independent if they have no effect on each other 10 of 18 r=-1 implies perfect negative correlation 11 of 18 The equation of the line of regression is y=a+bx 12 of 18 Extrapolation is unreliable because the value is outside the range of the data 13 of 18 A Sample Space is a list of all possible outcomes 14 of 18 A Random Variable may be discrete or continous 15 of 18 E(aX+b) = aE(X)+b 16 of 18 When all the probabilities are the same the discrete random variable is uniform 17 of 18 The normal distribution Z has mean 0 and standard distribution 1 18 of 18
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