College Statistics Quiz
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REGRESSION AND CORRELATION
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An environmental scientist studies the relationship between the concentration of a pollutant in a river (in ppm) and the population density of a certain fish species (in fish per cubic meter). The initial analysis yields a correlation coefficient of r=−0.15r = -0.15 and a regression line with a slope near zero. However, a review of the data reveals one data point that is a severe outlier: a pristine, protected area with a near-zero pollutant level and an exceptionally high fish density.
Based on the passage, if this single outlier is removed and the analysis is re-run, what is the most probable impact on the correlation coefficient and the slope of the regression line?
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