MATH 10041 Lecture Notes - Lecture 8: Graphing Calculator, Scatter Plot
27 Feb 2019
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Trend the general tendency of the scatterplot as you read from left to right typical trends increasing, called a positive association: decreasing, called a negative association, no trend, if there is an uphill nor downhill tendency. Strength of an association: scatterplots with large amounts of scatter or vertical variation indicate a weak association, scatterplots with small amounts of scatter or little vertical variation indicate a strong association. Shape: linear: scatterplots that cluster around a line model linear trends this scatterplot shows there is a linear association between volume of searches for the word vampire and the word zombie . Shape: non-linear: sometimes there are trends in data that are non-linear trends that are better modeled by a curve rather than a line. Writing descriptions of associations: when writing a description of an association between two numerical values, always include, trend, shape, strength in addition, mention any observations that don"t fit in the general trend (if any)
