In an atomic emission spectroscopy analysis of 107 randomly selccted of the metal is Vanadium.With a significance level f 0.01,test the hypothesis that the total metal concentration in all coal ash is greater than 13% Nanadium. samples of coal ash, aO.6%
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- calculate the number of hydrogen atoms in a 140.0g sample of tetraborane (B4H10)?1.56 Longleaf pine trees. The Wade Tract in Thomas County, Georgia, is an old-growth forest of longleaf pine trees (Pinus palustris) that has survived in a relatively undisturbed state since before the settlement of the area by Europeans. A study collected data on 584 of these trees. One of the variables measured was the diameter at breast height (DBH). This is the diameter of the tree at 4.5 feet, and the units are centimeters (cm). Only trees with DBH greater than 1.5 cm were sampled. Here are the diameters of a random sample of 40 of these trees: PINES 27 10.5 13.3 26.0 18.3 52.2 9.2 26.1 17.6 40.5 31.8 47.2 11.4 2.7 69.3 44.4 16.9 35.7 5.4 44.2 2.2 4.3 7.8 38.1 2.2 11.4 51.5 4.9 39.7 32.6 51.8 43.6 2.3 44.6 31.5 40.3 22.3 43.3 37.5 29.1 27.9 (a) Find the five-number summary for these data. (b) Make a boxplot. (c) Make a histogram. (d) Write a short summary of the major features of this distribution. Do you prefer the boxplot or the histogram for these data?In a Ni-Cd battery, a fully charged cell is composed of nickelic hydroxide. Nickel is an element that has multiple oxidation states. Assume the following proportions of the states: Nickel Charge Proportions Found 0 0.17 +2 0.34 +3 0.33 +4 0.5-0.34 Determine the mean of the nickel charge. Please enter the answer to 2 decimal places.
- John investigated the quantitative determination of Cr in high-alloy steels by a potentiometric titration of Cr6+. Before titrating, the steel was dissolved in acid and the chromium oxidized to Cr6+ by peroxydisulfate. Following are the results (%w/w Cr) for the analysis of a single reference steel: 16.968, 16.922, 16.840, 16.883, 16.887, 16.977, 16.857, 16.728 Calculate the mean, standard deviation and the 95% confidence interval of the meanPeriodically, the county Water Department tests the drinking water of homeowners for contminants 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 (?μg/L) copper (mg/L) 3.33.3 0.6280.628 3.33.3 0.2930.293 0.30.3 0.7830.783 4.74.7 0.1950.195 55 0.3780.378 1.41.4 0.2330.233 0.90.9 0.1010.101 0.90.9 0.6980.698 3.63.6 0.80.8 1.21.2 0.7610.761 (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. _____≤μ≤_____ (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. ______≤μ≤______The average concentration of cadmium (Cd) in tea leaves sample is 68.0(±1.5) ppm Cd. Calculate .8 * the coefficient of variation (CV) for sample is 2.2 O 0.11 O 0.012 O 3.4 O 0.012 O
- An environmental scientist developed a new analytical method for the determination of cadmium (Cd+) in mussels. To validate the method, the researcher measured the Cdt concentration in standard reference material (SRM) 2976 that is known to contain 0.82 + 0.16 ppm Cd+. Five replicate measurements of the SRM were obtained using the new method, giving values of 0.787, 0.758, 0.824, 0.838, and 0.765 ppm Calculate the mean (x), standard deviation (s,), and the 95% confidence interval. A list of i values can be found in the Student's table. X3= Ppm Ppm 95% confidence interval: + Ppm Does the new method give a result that differs from the known result of the SRM at the 95% confidence level? no yesA study measures the sorption rate of three different types of organic chemical solvents. These solvents are used to clean industrial-fabricated metal parts and are potential hazardous waste. Independent samples of solvents from each type were tested and their sorption rates were recorded as a mole percentage. Aromatics Chloroalkenes Esters 1.06 0.95 1.58 1.12 0.29 0.53 0.79 1.45 0.83 0.06 0.54 0.82 0.57 0.44 0.17 0.89 1.16 0.10 0.61 0.65 0.43 0.51 Suppose that the sampled sorption rates for the three solvents came from a decidedly non-normal population, perform the hypothesis test to determine if there is significant differences in the sorption rates of the 3 solvents. What is the value of the test statistic?A study measures the sorption rate of three different types of organic chemical solvents. These solvents are used to clean industrial-fabricated metal parts and are potential hazardous waste. Independent samples of solvents from each type were tested and their sorption rates were recorded as a mole percentage. Aromatics Chloroalkenes Esters 1.06 0.95 1.58 1.12 0.29 0.53 0.79 1.45 0.83 0.06 0.54 0.82 0.57 0.44 0.17 0.89 1.16 0.10 0.61 0.65 0.43 0.51 Suppose that the sampled sorption rates for the three solvents came from a decidedly non-normal population, perform the hypothesis test to determine if there is significant differences in the sorption rates of the 3 solvents. What is the proper conclusion to this test? Choose the capital letter corresponding to your answer. A. The sorption rates are just the same. B. The sorption rates are significantly different. C. Aromatics and Esters have different sorption rates. D. Chloroalkenes and Esters have same sorption rates. E. None of the above
- The carbon monoxide (CO) level in a manufacturing plant is supposed to be about 50 parts per million (ppm). However the actual CO levels are quite variable. Ten CO measurements are taken at various times during the day: Test if the average carbon monoxide (CO) level is not 5 0 ppm at the manufacturing plant if the population standard is 8.07. Use 10% level of significance."Color fastness to wash" of a colored textile fabric is defined to be the fabric's resistance to changes in color when subjected to repeated washing of the fabric. The test for ensuring the fastness of colored fabrics is performed in a dying lab. A newly manufactured lot of a red multifiber fabric baseline color measurement of each swatch. The 10 swatches undergo 10 identical washes, after which the color of each swatch is again measured by the same spectrophotometer. This procedure was repeated after 25 washes and again after 50 washes of the 10 swatches. sent to a dying lab for a wash fastness test. Ten swatches of the fabric are cut, each measuring 40 by 100 millimeters. A spectrophotometer is used to obtain a precise Which of the following is a true statement regarding this study? O This study uses independent groups to compare the color of the fabric at three points in time. O This is an observational study. O This is a repeated measures design that examines the change in color…is a radionuclide used widely in nuclear medicine. 99m Tc is combined with another substance that is readily absorbed by a targeted (99 mTc) Technetium-99 body organ. Then, special cameras sensitive to the gamma rays emitted by the technetium are used to record pictures of the organ. Suppose that a technician prepares a sample of 99m, Tc-pyrophosphate to image the heart of a patient suspected of having had a mild heart attack. Part: 0 / 2 Part 1 of 2 (a) At noon, the patient is given 10 mCi (millicuries) of 99m 99m Tc. If the half-life of "Tc is 6 hr, write a function of the form Q (t) = Qe - kt to model the radioactivity level Q (t) aftert hours. Round k to four decimal places. Do not round intermediate calculations. The radioactivity level function is Q (t) =. e