The following data is representative of that reported in an
article on nitrogen emissions, with x = burner
area liberation rate (MBtu/hr-ft2)
and y = NOx emission
rate (ppm):
x
100
125
125
150
150
200
200
250
250
300
300
350
400
400
y
150
140
180
220
200
320
280
400
430
440
400
610
620
660
(a) Assuming that the simple linear regression model is valid,
obtain the least squares estimate of the true regression line.
(Round all numerical values to four decimal places.)
(b) What is the estimate of expected
NOx emission rate when burner area
liberation rate equals 210? (Round your answer to two decimal
places.)
(c) Estimate the amount by which you expect
NOx emission rate to change when burner
area liberation rate is decreased by 60. (Round your answer to
two decimal places.)