To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two different locations. To compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations are different. For each location, calculate the standard deviation and report it with two significant figures. location 1 standard deviation: location 2 standard deviation: What is the calculated F value for comparing the standard deviations? Feale = Sample 1 2 no O yes 3 4 5 Location 1 (% Location 2 (2 C) C) 10.40 10.10 10.30 10.90 10.30 10.30 10.40 10.80 10.20 10.40 Are the standard deviations for the two locations significantly different at the 95% confidence level?

To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two different locations. To compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations are different. For each location, calculate the standard deviation and report it with two significant figures. location 1 standard deviation: location 2 standard deviation: What is the calculated F value for comparing the standard deviations? Feale = Sample 1 2 no O yes 3 4 5 Location 1 (% Location 2 (2 C) C) 10.40 10.10 10.30 10.90 10.30 10.30 10.40 10.80 10.20 10.40 Are the standard deviations for the two locations significantly different at the 95% confidence level?

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter8: Sampling, Standardization, And Calibration

Section: Chapter Questions

Problem 8.13QAP

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To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two different locations. To compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations are different. For each location, calculate the standard deviation and report it with two significant figures. What is the calculated F value for comparing the standard deviations? Are the standard deviations for the two locations significantly different at the 95% confidence level? ample Location 1 (% C) Location 2 (% C) 1 10.40 10.10 2 10.30 10.90 3 10.30 10.20 4 10.40 10.70 5 10.30 10.30
To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two different locations. To compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations are different. Location 1 Standard deviation = 0.050 Location 2 standard deviation = 0.34 a) What is the calculated ? value for comparing the standard deviations? Fcalc = __________________
To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two different locations. To compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations are different. Location 1 standard deviation: 0.050 Location 2 standard deviation: 0.34 What is the calculated ? value for comparing the standard deviations?
Replicate water samples are analyzed for water hardness with the following results: 102.2, 102.8, 103.1, and 102.3 ppm CaCO3. What is the (a) the standard deviation, (b) the relative standard deviation, (c) variance.
A chemical industry discharges a waste contaminated with trichloroethylene (TCE) to the city sewer system. By law, the concentration of TCE must be 1 mg/L or less. To enforce this law, the Department of Environmental Conservation (DEC) conducts random testing. The chief environmental engineer for the chemical company knows that the mean TCE concentration in the waste is 0.064 mg/L, and the standard deviation is 0.022 mg/L. The TCE concentration can be assumed to be a normal random variable. What is the probability that the company will fail a random test by the DEC? [In other words, the probability that a random sample will have TCE > 0.1 mg/L.] Show your work and draw a labeled sketch to show what area of the normal distribution curve you used to solve the problem. What is the probability that the company will fail two consecutive random tests? The tests can be assumed to be independent of each other. Show your work. Determine the concentration of TCE that is exceeded only 10%…
5. A new method for measuring NO2 in air was developed and compared to a conventional method with the results summarized in the following table: Method Average concentration (ppb) Standard deviation (ppb) Number of measurementsConventional 56.0 3.1 7New 51.9 2.8 8 a) Is the standard deviation for the new method significantly different from that of the conventional method? b) Does the new method give an average concentration similar to the conventional method at the 95% confidence level?