Mathematics, 21.03.2020 10:24, starfox5454
Keeping water supplies clean requires regular measurement of levels of pollutants. The measurements are indirect- a 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 centigrams per liter of water.
Nitrates 10 7 15 30 20 60 60 100 140 320
Absorbance 5 7 10 25 40 90 130 190 230 220
Chemical theory says that these data should lie on a straight line. If the correlation is not at least 0.997, something went wrong and the calibration procedure is repeated.
(a) Find the correlation r.
r =
(b) Must the calibration be done again? (Answer YES or NO).
Answers: 2
Mathematics, 21.06.2019 22:30, wednesdayA
Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?
Answers: 1
Mathematics, 22.06.2019 01:30, scholarlystudenttt28
Someone me! will award brainliest if u explain and answer!
Answers: 3
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