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Math Chapter 4 ● weak associations result in a large amount of scatter in the scatterplot ● the stronger the association, the better the model is for prediction ● variation is not important when studying scatterplots ● correlation coefficients can range from -1 to 1 ○ its not possible to have a correlation coefficient outside this range ● the correlation coefficient is a measure that describes the direction and strength of a linear relationship ○ can be used for two quantitative variables only ● a correlation coefficient of zero indicates that there is no linear relationship between the two quantitative variables ● the mean of the data set is often the best estimate of the parameter ○ the best estimate is also the be