Hispanic population. The US census collects data on race and ethnicity of Americans, among many other variables. The histogram below shows the distribution of the percentage of the population that is Hispanic in 3,142 counties in the US in 2010. Also shown is a histogram of logs of these values.
Hispanic % 0 20 40 60 80 100
log(% Hispanic) −2 −1 0 1 2 3 4
(a) Describe the numerical distribution and comment on why we might want to use log-transformed values in analyzing or modeling these data.
(b) What features of the distribution of the Hispanic population in US counties are apparent in the map but not in the histogram? What features are apparent in the histogram but not the map?
(c) Is one visualization more appropriate or helpful than the other? Explain your reasoning.
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