Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruit < vegetables < cereals < nuts < corpse). Geochemical surveys take soil samples to determine phosphorous content (in ppm, parts per million). A high phosphorous content may or may not indicate an ancient burial site, food storage site, or even a garbage dump. Independent random samples from two regions gave the following phosphorous measurements (in ppm). Assume the distribution of phosphorous is mound-shaped and symmetric for these two regions. Region I: X₁; n₁ = 15 853 1,549 1,230 875 1,080 2,330 1,850 2,340 1,080 910 1,130 1,450 1,260 1,010 Region II: X2; 2 = 14 1,860 538 812 790 1,230 1,770 960 1,650 860 890 640 1,180 1,160 1,050 1,020 (a) Use a calculator with mean and standard deviation keys to find ☑₁ and and s₁ (in ppm). (Round your answers to four decimal places.) 1 = 1421.0000 × ppm = 408.6474 ppm Use a calculator with mean and standard deviation keys to find ✗2 and S2 (in ppm). (Round your answers to four decimal places.) = 1042.1429 × ppm 52 = 377.6941 × ppm (b) Let μ₁ be the population mean for decimal place.) 227.8 to 530.0 ppm X1 and let M2 be the population mean for X2. Find an 80% confidence interval for μ₁ - μ2. (Enter your answer in the form: lower limit to upper limit. Include the word "to." Round your numerical values to one

College Algebra

10th Edition

ISBN:9781337282291

Author:Ron Larson

Publisher:Ron Larson

Chapter6: Systems Of Equations And Inequalities

Section: Chapter Questions

Problem 17PS: Cholesterol Cholesterol in human blood is necessary, but too much can lead to health problems. There...

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Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruit < vegetables < cereals < nuts < corpse). Geochemical surveys take soil samples to determine phosphorous content (in ppm, parts per million). A high phosphorous content may or may not indicate an ancient burial site, food storage site, or even a garbage dump. Independent random samples from two regions gave the following phosphorous measurements (in ppm). Assume the distribution of phosphorous is mound-shaped and symmetric for these two regions. Answer parts a-b please.