The data in the table below were obtained during a determination of lead in lake water by
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Question:
The data in the table below were obtained during a determination of lead in lake water by atomic absorption spectrometry (show calculations for the following questions)
Lead concentration, mg/L
0.0
2.0
4.0
6.0
8.0
10.0
Absorbance, A
0.002
0.150
0.294
0.434
0.570
0.704
a. Assuming a linear relationship between the variables, find the least-squares estimates of the slope and intercept. What is the equation of the line? (answer in slope-intercept form, y=mx+b)
b. What are the standard deviations of the slope and intercept?
c. What is the standard error (SE) of the estimate?
d. What is the concentration (mg/L) of lead from a water sample with an absorbance of 0.413.
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