9.State the null hypothesis and the alternative hypothesis for this situation: "The level of apollutant in a river adjacent to a chemical plant is regularly monitored. Over a period of years,the normal level of the pollutant of 0.5 ppm has been established by chemical analyses.Recently, the company has made several changes to the plant that appear to have increased thelevel of the pollutant. The company wants proof that the pollutant level has not increased."10. State the null hypothesis and the alternative hypothesis for this situation: "Sewage and industrialpollutants dumped into a body of water can reduce the dissolved oxygen concentration andadversely affect aquatic species. In one study, weekly readings are taken from the same locationin a river over a two-month period. The mean dissolved oxygen obtained from the analysis is 4.5ppm. Some scientists think that 5.0 ppm is a dissolved oxygen level that is marginal for fish tolive. They want to proof whether the mean dissolved oxygen concentration is less than 5.0ppm."

Testing of hypothesis is the test by which we decide how far the prior guess is accurate. A null…

Answered: State the null hypothesis and the…

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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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: x,; n, = 15 875 1,080 2,330 1,850 1,860 853 1,551 1,230 2,340 1,080 910 1,130 1,450 1,260 1,010 Region II: x,; n, = 14 540 808 790 1,230 1,770 960 1,650 860 890 640 1,180 1,160 1,050 | 1,020 In USE SALT (a) Use a calculator with mean and standard deviation keys to verify that x,, S,, x2, and s,. (Round your answers to four decimal places.) X1 ppm S. = ppm X2 ppm 52 ppm (b) Let u, be the…
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