Suppose that a study finds an association between elevation (in km) and lung cancer inci- dence (in cases per 100,000 individuals). Incidence of cancer appears to be lower at higher elevations. An article reports that "lung cancer incidence decreases by 8.14 for each 1 km increase in elevation." Does the sentence in quotation marks refer to (a) the correlation of the data, (b) the slope of the regression line, (c) the intercept of the regression line, or (d) none of these?

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A:

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