9.83 Toxic Mushrooms? Cadmium, a heavy metal, is toxic to ani-mals. Mushrooms, however, are able to absorb and accumulate cad-mium at high concentrations. The Czech and Slovak governmentshave set a safety limit for cadmium in dry vegetables at 0.5 part permillion (ppm). M. Melgar et al. measured the cadmium levels in arandom sample of the edible mushroom Boletus pinicola and pub-lished the results in the paper "Influence of Some Factors in Toxicityand Accumulation of Cd from Edible Wild Macrofungi in NW Spain"(Journal of Environmental Science and Health, Vol. B33(4), pp. 439-455). Here are the data.0.240.920.590.191.330.62 0.16 0.770.33 0.25 0.59 0.32At the 5% significance level, do the data provide sufficient evi-dence to conclude that the mean cadmium level in Boletus pinicolamushrooms is greater than the government's recommended limit of0.5 ppm? Assume that the population standard deviation of cadmium levels in Boletus pinicola mushrooms is 0.37 ppm. (Note: The sumof the data is 6.31 ppm.)

The given sample size is 12, sum of the samples is 6.31, population standard deviation is 0.37.

Answered: 9.83 Toxic Mushrooms? Cadmium, a heavy…

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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Cloud seeding, a process in which chemicals such as silver iodide and frozen carbon dioxide are introduced by aircraft into clouds to promote rainfall was widely used in the 20-th century. Recent research has questioned its effectiveness [Journal of Atmospheric Research (2010, Vol. 97 (2), pp. 513-525)]. An experiment was performed by randomly assigning 52 clouds to be seeded or not. The amount of rain generated was then measured in acre-feet. Here are the data for the unseeded and seeded clouds: Unseeded: 81.2 26.1 95.0 41.1 28.6 21.7 11.5 68.5 345.5 321.2 1202.6 1.0 4.9 163.0 372.4 244.3 47.3 87.0 26.3 24.4 830.1 4.9 36.6 147.8 17.3 29.0 Seeded: 274.7 302.8 242.5 255.0 17.5 115.3 31.4 703.4 334.1 430.0 1697.8 118.3 198.6 129.6 274.7 119.0 1656.0 7.7 40.6 92.4 200.7 32.7 4.1 978.0 489.1 2745.6 Construct a frequence distribution for the combined cloud-seeding rain measurements. Use 6 bins. Class Frequency -250 < x < 250 250 < x < 750 750 < x < 1250 1250 < x < 1750 1750 < x < 2250 2250…
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