A scatterplot is best for showing the extent of
a correlation and making sense of that correlation. If the y-axis variable
increases as the x-axis increases the correlation is positive. If the y-axis
variable decreases as the x-axis variable increases or vice-versa, the
correlation is negative. If there is no correlation, between the variables the
points appear randomly placed on the coordinate plane. This scatterplot
displays the correlation between the price of a diamond and the size of diamonds
in carats. The trend shows that as
the size of the diamond increases in carats, the price also increases.
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