The table below shows (lifetime) peptic ulcer rates (per 100 population), UU, for various family incomes, xx, as reported by the 1989 National Health Interview Survey.
Income | 4000 | 6000 | 8000 | 12000 | 16000 | 20000 | 30000 | 45000 | 60000 |
Ulcer rate | 13.5 | 13.6 | 13.4 | 12.8 | 12.2 | 12.6 | 11.8 | 9.3 | 7.9 |
(a) Find the equation of the regression line.
Ulcer rate, U(x)=U(x)=
b) Estimate the peptic ulcer rate for an income level of x0=x0= 27000 according to the linear model in part (a).
Ulcer rate, U(x0)=
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