A researcher estimates the following quadratic relationship between daily earnings (in dollars) and years of education:
earnings_hat = 36 + 8education + 2education^2
What is the estimated increase in earnings associated with moving from 9 to 10 years of education?
A. $8 per day
B. $10 per day
C. $46 per day
D. Need more information.
Answer: C. $46 per day