Stats Key Facts Knowledge 5.0 / 5 based on 1 rating ? MathematicsStatistics 1ASEdexcel Created by: EmiLy1703Created on: 13-04-17 11:27 Define an event One or more possible outcomes 1 of 22 Define sample space A list of all possible outcomes 2 of 22 Write down the addition rule P(A or B) = P(A) + P(B) - P(A and B) 3 of 22 What are independent events? Events that don't impact on each other 4 of 22 How would you prove that events are independent? (2 ways) Given that rule or P(A and B) = P(A) x P(B) 5 of 22 What are mutually exclusive events? Two things that can't happen at the same time 6 of 22 Show two ways of mutually exclusive events Sample space or P(A and B) = 0 7 of 22 Write down the given that rule P(A given B) = P(A and B) divided by P(B) 8 of 22 Which other chapters does maths from chapter 5 crop up? Chapter 9 9 of 22 What does PMCC mean and what does it show? PMCC = product moment correlation coefficient. It shows if there is a strong positive or negative correlation 10 of 22 What is the PMCC range and what do the numbers mean? Range from -1 to 1 showing strong positive or negative correlation 11 of 22 How does coding affect PMCC? Coding doesn't affect PMCC 12 of 22 When is regression anaylis appropriate? Only when there is a significant form of correlation 13 of 22 The independent variable should be on which axis... X axis 14 of 22 Explain what is meant by extrapolation and interpolation and comment on their reliability Extrapolation - predictions outside of the data range, unreliable. Interpolation - within the data range, reliable 15 of 22 Why would coding be used in regression anaylsis and what would the impact of coding be? Convert a large value 16 of 22 How do you find expectation of x? Value multiplied by probability of occuring and then add them together 17 of 22 How do you find the variance of x? Value squared multiplied by probability of occuring and then - mean squared 18 of 22 For a fair regular die, write down a probability distribution and a probability function Distribution all outcomes have 1/6 of a chance. Function P(X=x) 1/6 x=1, 2, 3, 4, 5, 6 19 of 22 What does the letter F relate to in regards to probability function or distribution? F stand for cumulative 20 of 22 How does coding affect expectation? Does as expected 21 of 22 How does coding affect variance? Adding doesn't affect, multiplying = value squared 22 of 22

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