This figure shows an estimated linear equation along with its 95% prediction intervals. Assume that X counts customers and Y measures dollars.

(a) Visually estimate the intercept b0 and the slope b1.
(b) Is se (b1) less than 3, about 3, or more than 3?
(c) Is the value of r2 approximately equal to 0.2, 0.5, or 0.8?
(d) Estimate se, the standard deviation of the residuals.

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