=+from a thermocouple placed on a traversing vehicle. Selected data are given (read from a scatterplot in the article).

x 22 21 0 1 2 3 4 y 23.9 22.1 22.0 21.2 0.0 1.9 0.6 x 5 6 7 y 2.1 1.2 3.0 Estimate the true regression line.

t 5 a 2 hypothesized value sa a 6 1t critical value 2sa sa1bx*