7. The three sets of replicate results below were accumulatedfor the analysis of the same sample. Pool these data toobtain the most efficient estimate of the mean analytecontent and the standard deviation.Lead content/ppm:Set 1Set 2Set 31.9.769.879.852.9.429.649.913.9.539.719.429.819.49

Step 1: Organize the DataEach set contains the following measurements (including the two additional…

Answered: 7. The three sets of replicate results…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter8: Sampling, Standardization, And Calibration

Section: Chapter Questions

Problem 8.10QAP

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2. The following values were obtained from the calibration of a 10mL pipet 10.28, 9.99, 10.12, and 9.63 mL. Calculate the mean value and the standard deviation from the mean.
Analysis of several plant-food preparations for potassium ion yielded the following data: Sample Percent K+ 1 3.90, 3.96, 4.16, 3.96 2 4.48, 4.65, 4.68, 4.42 Find the mean ; standard deviation variance and RSD for each sample.
A volume of 250 ml of a 0.05 M solution of a reagent of formula weight (relative molecular mass) 40 was made up, the weighing being done by difference. The standard deviation of each weighing was 0.0001 g. 1 (a) What were the standard deviation and relative standard deviation of the weight of reagent used?
A titrimetric method for the determination of calcium in limestone was tested by analysis of an NIST limestone containing 30.15% CaO. The mean result of four analyses was 30.26% CaO, with a standard deviation of 0.085%. By pooling data from several analyses, it was established that s   = 0.094% CaO.a. Do the data indicate the presence of a systematic error at the 95% confidence level?b. Do the data indicate the presence of systematic error at the 95% confidence level if no pooled value for s was available?
What is limit of detection? What is standard deviation?
3 thank you !
Can you please fill the rest of tghe data based on the on inforamtion you have and answer Average concentratuon of NaOH Standard deviation of concentration
Mass of sample Mass of filter paper + AgCl Mass of filter paper Mass of AgCl Mass of Cl in original sample (show calculations) Percent chloride in original sample (show calculations) Extcon bre Gravimetric Analysis of a Chloride Salt Standard deviation (show calculations) 17 Relative standard deviation expressed as a percent (show calculations) Trial 1 0.38438 1-259 0.539 Average percent chloride (show calculations) 0.719 Trial 2 0.3155 g 1.229 0.52g 0.79 11 Trial B Do any of your results differ from the mean by more than two standard deviations? Reported percent chloride ± % 09 EV 40
A young researcher was evaluating a standard method for determining the methylmercury content in blue fin tuna using high performance liquid chromatography (HPLC). She determined the standard deviation (?)(s) for the method to be 0.440.44 ppb and assumed that ?s was a good approximation of ?σ . As a test, she used this method to evaluate the methylmercury content in a National Institutes of Standards and Technology (NIST) standard and determined the unknown amount to be within 0.210.21 ppb (?)(μ) of the known mean with 99% probability. How many replicate measurements of the NIST standard did the researcher perform?
A biosensor was developed to measure the concentration of aqueous arsenic. To determine the accuracy of the sensor, the sensor was tested against a standard reference solution of known concentration. The concentration measured by the new biosensor can be considered accurate if the standard deviations for the concentration determined by the biosensor and the accepted, known concentration of the reference solution are not significantly different. the standard deviations for the concentration determined by the biosensor and the accepted, known concentration of the reference solution are not significantly different, and tcalculated < ttable. the accepted, known concentration of the reference solution falls outside the 95% confidence interval for the biosensor results. the accepted, known concentration of the reference solution falls within the 95% confidence interval for biosensor results.
both questions already have the answers but it need's me to show all the work and I don't know how to put it togther or in other words how to show the work for both questions. :)
The same chloride analysis but using a new method for which the standard deviation was not known, gave the following replicate results, mean and estimated standard deviation: Chloride (ppm) = 346, 359, 350; Mean = 351.67 ppm; Standard deviation = 6.66ppm. Solve for the CI for the 3 determinations at 95% probability level.

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