d. Predict peak photovoltage when % absorption is 19.1, and compute the value of the corresponding residual.

e. The article’s authors claim that there is a useful linear relationship between % absorption and peak photovoltage. Do you agree? Carry out a formal test.

f. Give an estimate of the change in expected peak photovoltage associated with a 1% increase in light absorption. Your estimate should convey information about the precision of estimation.

g. Repeat part

(f) for the expected value of peak photovoltage when % light absorption is 20.

78. In Section 12.4, we presented a formula for V(
ˆ

0
ˆ

1x*)

and a CI for
0
1x*. Taking x*
0 gives 2

ˆ

0 and a CI for

0. Use the data of Example 12.11 to calculate the estimated standard deviation of
ˆ

0 and a 95% CI for the y-intercept of the true regression line.