eeping water supplies clean requires regular measurement of levels of pollutants. The measurements are indirecta typical analysis involves forming a dye by a chemical reaction with the dissolved pollutant, then passing light through the solution and measuring its "absorbence." To calibrate such measurements, the laboratory measures known standard solutions and uses regression to relate absorbence and pollutant concentration. This is usually done every day. Here is one series of data on the absorbence for different levels of nitrates. Nitrates are measured in milligrams per liter of water. Nitrates 50 50 100 200 400 800 1200 1600 2000 2000 Absorbence 7.0 7.4 12.7 24.0 47.0 94.0 138.0 183.0 231.0 226.0 (d) What is the estimated nitrate level in a water specimen with absorbence 43? (Use 1 decimal place.) I've come up with 1205.783 rounding to 1 decimal at 1205.8 and it's still not correct. What am I missing here?
eeping water supplies clean requires regular measurement of levels of pollutants. The measurements are indirecta typical analysis involves forming a dye by a chemical reaction with the dissolved pollutant, then passing light through the solution and measuring its "absorbence." To calibrate such measurements, the laboratory measures known standard solutions and uses regression to relate absorbence and pollutant concentration. This is usually done every day. Here is one series of data on the absorbence for different levels of nitrates. Nitrates are measured in milligrams per liter of water. Nitrates 50 50 100 200 400 800 1200 1600 2000 2000 Absorbence 7.0 7.4 12.7 24.0 47.0 94.0 138.0 183.0 231.0 226.0 (d) What is the estimated nitrate level in a water specimen with absorbence 43? (Use 1 decimal place.) I've come up with 1205.783 rounding to 1 decimal at 1205.8 and it's still not correct. What am I missing here?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Keeping water supplies clean requires regular measurement of levels of pollutants. The measurements are indirecta typical analysis involves forming a dye by a chemical reaction with the dissolved pollutant, then passing light through the solution and measuring its "absorbence." To calibrate such measurements, the laboratory measures known standard solutions and uses regression to relate absorbence and pollutant concentration. This is usually done every day. Here is one series of data on the absorbence for different levels of nitrates. Nitrates are measured in milligrams per liter of water.
| Nitrates | 50 | 50 | 100 | 200 | 400 | 800 | 1200 | 1600 | 2000 | 2000 |
| Absorbence | 7.0 | 7.4 | 12.7 | 24.0 | 47.0 | 94.0 | 138.0 | 183.0 | 231.0 | 226.0 |
(d) What is the estimated nitrate level in a water specimen with absorbence 43? (Use 1 decimal place.)
I've come up with 1205.783 rounding to 1 decimal at 1205.8 and it's still not correct. What am I missing here?
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