S1 Chapter 7 0.0 / 5 ? StatisticsRegressionASEdexcel Created by: Former MemberCreated on: 23-02-14 15:22 Explanatory value The independent value - goes along x axis, is the thing that I change. 1 of 8 Response value The dependent value - goes up y axis, changes as a result of the independent. 2 of 8 Equation of regression line (of y on x) GIVEN IN BOOKLET y=a+bx where b = Sxy/Sxx and a = ybar - bx̄ 3 of 8 x̄ (∑x)/n 4 of 8 With coded data, find y on x regression line with given coded data... then sub in the y code to equal the y regression coded and same with x. 5 of 8 Coded regression line may be different to actual regression line. Linear changes affect the answer. 6 of 8 Interpolation Estimate the value of a dependent variable within the range of the data. RELIABLE ESTIMATE 7 of 8 Extrapolation Estimate the value of a dependent variable outside of the data range. UNRELIABLE ESTIMATE 8 of 8
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