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10 cards from this deck
(9, 15)
The mean point (x̄, ȳ)
Yes — interpolation; estimate is reliable
Yes — extrapolation; less reliable
Interpolation; estimate is reliable
Extrapolation; estimate not reliable
21.5 hours; interpolation — reliable estimate
29 hours; extrapolation — less reliable
Through the mean point (x̄, ȳ) — averages of x and y
Extrapolation; not reliable — state reason and working
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