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Splitting the file on Vehicle
type has made the
relationship between sales and fuel efficiency
much more clear.
There is a significant and fairly strong positive
correlation between sales and fuel efficiency for
automobiles.
For trucks, the correlation is positive but not
significantly different from 0.
Reaching these conclusions has required some
work and shown that correlation analysis using the
Pearson correlation coefficient is not always
straightforward. For comparison, see how
you can avoid the difficulty of transforming variables by using
nonparametric correlation measures.
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Correlations |