A new method was created to determine arsenic in rice. To validate this method, a reference standard was used with a certified concentration of 2.1 ppm of Arsenic, with a standard deviation of 0.7 ppm . When analyzing the reference standard 7 times, with the new method, an average of 2.87 ppm was obtained with a standard deviation of 0.4 ppm. These results show that the new method Has it been validated? Does it have systematic errors? Has a precision similar to that of the reference standard

A new method was created to determine arsenic in rice. To validate this method, a reference standard was used with a certified concentration of 2.1 ppm of Arsenic, with a standard deviation of 0.7 ppm . When analyzing the reference standard 7 times, with the new method, an average of 2.87 ppm was obtained with a standard deviation of 0.4 ppm. These results show that the new method Has it been validated? Does it have systematic errors? Has a precision similar to that of the reference standard

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A set of samples from an abandoned industrial site detected a suspected groundwater contaminant at a mean concentration of 0.045 µg/L with a standard deviation of 0.007 µg/L. How many samples are required to be collected at a confidence level of 95% and power of 90% if the mean background concentration of the contaminant is 0.035 µg/L? О А.З О В. 4 С. 5 O D. 6
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?
20 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? Fcale = no Sample 1 2 3 4 5 Are the standard deviations for the two locations significantly different at the 95% confidence level? O yes Location 1 (% Location 2 (%) C) C) 10.40 10.10 10.30 10.90 10.30 10.30 10.40 10.80 10.20 10.40
Solve both parts otherwise I will downvote
What is limit of detection? What is standard deviation?
I need help with calculating the standard deviations and percent error- (experimental-theoretical/theoretical)*100.The theoretical values for the unknowns are water- 1.00g/mL, ethyl alcohol- 0.79g/mL and glycerol - 1.26g/mL. The down arrows mean the number is the same for that column
Find the result (c) and the absolute standard deviation (sc) as propagated in the following calculation. Express final result and its propagated standard deviation with an appropriate number of significant figures. a = 5.75 (+0.05)+0.833 (±0.001); b = 3.75 (±0.02);c = alb
The following densities of water were obtained by Student A: 1.07 g/mL, 1.14 g/mL, and 1.13 g/mL. Show how Student A determined the density of water to be 1.11 ± 0.04 g/mL. Calculation for the average = 1.11 g/mL: Calculation for the standard deviation = 0.04 g/mL:
If it was discovered that a polyaromatic hydrocarbon (PAH) having a density of 1 g/cm3 has a concentration of 1 ppm in the soil, how much soil would be required if a standard deviation of 0.1 is desired for the fundamental sampling error?
How would you calculate Standard Deviation?
An ore sample was analyzed for its Fe content. Student A analyzed the sample a total of six times and her results had a standard deviation of 1.33. The same sample was analyzed five times by Student B and his results had a standard deviation of 3.42. To determine if their standard deviations are similar, they perform an F test. The calculated F value is and the table value of Fis 3 in your book for critical values of F. O 6.61; 7.39 O 6.61; 9.36 O 0.151; 9.36 O 2.57; 7.39 O 6.61; 6.98 Refer to Table 4-