Question 357235
Because the percentage of the U.S. population that was foreign-born decreased from 1910 through 1970 and then increased after that, an equation of the form y = ax^2 + bx + c, rather than a linear equation of the form y = mx + b, should be used to model the data.
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That makes sense.
A parabola opening up would model the changes occurring
in the problem.
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Cheers,
Stan H.