Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was 0.12 milligrams per liter (mg/L). A random sample of 10precipitation dates in 2007 results in the following data table. Complete parts (a) through (c) below.Click the icon to view the data table.-Data table(a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990.Ho: P= 0.12 mg/LH₁: μ# 0.12 mg/L0.074 0.075 0.071 0.257 0.1160.177 0.107 0.247 0.333 0.102(b) Construct a 90% confidence interval about the sample mean concentration of calcium precipitation.The lower bound isThe upper bound isPrint(Round to four decimal places as needed.)DoneX

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Answered: Calcium is essential to tree growth…

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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Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (g/L) copper (mg/L) 2.9 0.2 5.1 4.2 5.5 1.2 0.3 1.3 4.9 1.7 0.133 0.774 0.214 0.671 0.444 0.234 0.357 0.761 0.176 0.888 (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. OSASO (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. ≤H≤
A paint manufacturer wants to compare the drying times of two different colors of paint. Independent random samples of 10 cans of Eggshell and 10 cans of Ecru were selected and applied to similar surfaces. The drying times (in hours) were recorded. The data are below. Conduct the appropriate test and select its test statistic. Eggshell: 67 88 90 75 74 82 91 85 77 75 Ecru: 68 67 72 89 77 73 79 85 72 70 a. t (18) = -1.58 b. None of these C. r = .073 d.t (18) = -1.52 O O
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A county environmental agency suspects that the fish in a particular polluted lake have elevated mercury levels. To confirm that suspicion, five striped basses in that lake were caught and their tissues were tested for mercury. For the purpose of comparison, four striped basses in an unpolluted lake were also caught and tested. The fish tissue mercury levels in mg/kg are given below. Sample I(From Polluted Lake) 0.523 0.723 0.523 0.623 0.523 Sample II(From Unpolluted Lake) 0.323 0.223 0.523 0.323 0.000 (a) Construct the 95% confidence interval for the difference in the population means based on these data. (b) Test, at the 5% level of significance, whether the data provide sufficient evidence to conclude that fish in the polluted lake have elevated levels of mercury in their tissue.
The National Hurricane Center provides data that list the number of large (category 3, 4, or 5) hurricanes that have struck the United States, by decade, from 1851-2020. Is there sufficient evidence that the number of large hurricanes have remained constant (per decade)? What is the pvalue and results of the test? Decade Count Decade Count 1851-1860 6 1941-1950 10 1861-1870 1 1951-1960 8 1871-1880 7 1961-1970 6 1881-1890 5 1971-1980 4 1891-1900 8 1981-1990 5 1901-1910 4 1991-2000 5 1911-1920 7 2001-2010 8 1921-1930 5 2011-2020 10 1931-1940 8 Chi-squared test for given probabilitiesdata: stormsX-squared = 13.589, df = 16, p-value = 0.6293 A. pvalue=0.6293 is not <= alpha (0.05) therefore H0 is rejectedB. 107C. pvalue=0.6293 is <= alpha (0.05) therefore H0 is rejectedD. pvalue=0.6293 is not <= alpha (0.05) therefore H0 is not rejected

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