A Level Statistics: Unit 4 - Bivariate Data 0.0 / 5 ? StatisticsBivariate DataProduct Moment Correlation CoefficientsSpearmans Rank Correlation CoefficientsLeast Squares RegressionASEdexcel Created by: MrsHodgettsStatisticsCreated on: 13-06-22 15:36 There are three different types of this; positive, negative or none Correlation 1 of 18 This is when we estimate values from within the data range (this is more relaible) interpolation 2 of 18 This is when we estimate values from outside the data range (This is less reliable) extrapolation 3 of 18 The ___ moment correlation coefficients is a measure of the strength of a linear association between two variables product 4 of 18 The ____ rank correlation coefficient is a measure of the strength of a non-linear association between two variables spearmans 5 of 18 Values of the correlation coefficient between 0 and 0.2 are said to be ___positive weak 6 of 18 Values of the correlation coefficient between -0.2 and -0.7 are said to be ___ negative moderate 7 of 18 Values of the correlation coefficient between 0.7 and 0.9 are said to be ___positive strong 8 of 18 The formula for proving the value of PMCC can be found on this page in the formula booklet five 9 of 18 This is the more accurate of the two correlation coefficients PMCC 10 of 18 We could choose to use this is the data were presented on different scales SRCC 11 of 18 This variable is the one that you have control over and can manipulate in an experiment. On a scatter graph this will be plotted on the x axis explanatory 12 of 18 This variable is the one that you measure in an experiment. On a scatter graph this will be plotted on the y axis response 13 of 18 The least squares regression line is the statistical name for this line of best fit 14 of 18 The value of the a in the LSR represents this y intercept 15 of 18 The value of the b in the LSR represents this gradient 16 of 18 The value of a in the LSR tells us the value of y when the value of x is this zero 17 of 18 The value of b in the LSR tell us that for every increase of one in x, the increases by an ___ of b average 18 of 18
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