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AP Statistics (Chapter 3) Flashcards

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11122511625Correlation (r)Measures strength and direction ( + or - )0
11122511626Words to describe strengthStrong (when r is close to 1 or -1), moderately strong/weak, weak (when r is close to 0)1
11122511627Words to describe directionPositive, negative2
11122511628Correlation coefficientr3
11122511629r is resistant or non-resistant to outliers?Non-resistant4
11122511630If r=1Perfect positive linear slope5
11122511631If r=-1Perfect negative linear slope6
11122511632What are the units of r?r has no units7
11122511633What is the range of r?-1 < r < 18
11122511634ResidualObserved value (y) - predicted value (y "hat")9
11122511635Least squares regression line (LSRL)The line that makes the sum of the sqaures of the vertical distances of the data points from the line as small as possible.10
11122511636What point is always on the LSRL?(x¯, y¯ )11
11122511643Interpretation of the slope of the LSRLFor every one unit increase in ___(x)___ the predicted ___(y)___ increases/decreases on average by ___(b)___ units12
11122511644Coefficient of determinationIs the proportion of the variation in the values of y that is explained by the LSRL13
11122511645Coefficient of determination14
11122511646r² measures..."how good the LSRL is at predicting y"15
11122511647Interpretation of coefficient of determinationr² % of the variation in ___(y)___ is accounted for by the LSRL16
11122511650The sign of r matches the sign of...b1 (slope of the LSRL)17
11122511651Residual Plothelps determine if a linear model is an appropriate model for a data set18
11122511655OutlierA point that does not follow the pattern of the data and has a large residual.19
11122511656Influential pointany point that substantially changes the slope, y-int, r, r^2, or S20
11122511659Form, direction, and strength (IN CONTEXT)"Describing the scatterplot" means to discuss the...21
11122599485standard deviation of the residualstypical prediction error22
15303527039high leverage pointpoints that have much larger or smaller x-values than the other points in the data set23

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