Maths S1 0.0 / 5 ? MathematicsStatistics, averages and distributionsASEdexcel Created by: Sophie kendallCreated on: 16-05-13 16:06 How do you find a class bound? It is the midpoint between classes 1 of 16 What is the mode? The thing that happens most often 2 of 16 What is and independent variable? a variable that is independent of other variables 3 of 16 what is the median the middle value of ordered data 4 of 16 what is a mathematical model a simplification of a real world problem 5 of 16 how do you combine two means? (n1 x mean of X1+n2 x mean of X2) / n1+n2 6 of 16 what is a dependant variable? A variable that is dependant of other variables 7 of 16 What do you use to find the mean in grouped data? The midpoint 8 of 16 What is a variable that can have any value continuous 9 of 16 what is the formula for r in terms of correlation? sxy/squrt(ssx x sxy) 10 of 16 what does var(x) stand for and how is it calculated variance of x var(x) = E(X^2)-(E(X))^2 11 of 16 What is the probability addition rule? P(AUB)=P(A)+P(B)-P(AnB) 12 of 16 What does Sxx =? total(x^2)-(total x)^2/n 13 of 16 how do you find the standard deviation squrt(variance) 14 of 16 what does Sxy = totalxy - (totalx*totaly)/n 15 of 16 what does Syy =? totaly^2-(totaly)^2/n 16 of 16
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