Find the best predicted IQ score of someone with a brain size of 1275 cm 3 .
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Find the best predicted IQ score of someone with a brain size of 1275 cm3.
In each case, find the regression equation, letting the first variable be the predictor (x) variable. Find the indicated predicted value by following the prediction procedure summarized in Figure 10-5.
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Brain Size IQ 965 1029 1030 1285 1049 1077 1037 1068 1176 1105 90 85 86 102 103 97 124 125 102 114 Yes. The regression equation is a good model. Strategy for Predicting Values of Y Is the regression equation a good model? • The regression line graphed in the scatterplot shows that the line fits the points well. • r indicates that there is a linear correlation. • The prediction is not much beyond the scope of the available sample data. Substitute the given value of x into the regression equation ŷ = b + b₁x. No. The regression equation is not a good model. Regardless of the value of x, the best predicted value of y is the value of y (the mean of the y values). Figure 10-5 Recommended Strategy for Predicting Values of y
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