Question

Distinguishing Interpolated Data
A graph has average temperature (degrees Fahrenheit) on the x-axis, from 0 to 60, and total coat sales on the y-axis, from 0 to 100. A trend line goes through points (55, 50) and (65, 40).

Which temperature values would an interpolation be limited to?
less than 0
between 0 and 60
between 20 and 80
greater than 55

Answer 1

Between 0 and 60.

Interpolation estimates values inside the range of the observed data. The graph's x-axis (temperatures shown) runs from 0 to 60, so predicting within that interval is interpolation; using 65 would be extrapolation.