Which of the following statements about the sensitivity of an analytical method is true? O The sensitivity of an analytical method is the same as its detection limit. O The sensitivity of an analytical method is the smallest amount of analyte that the instrument is able to measure O The sensitivity of an analytical method is the response of the instrument to human error O The sensitivity of an analytical method is a measure of ability to determine whether slight differences in experimental results are significant

Which of the following statements about the sensitivity of an analytical method is true? O The sensitivity of an analytical method is the same as its detection limit. O The sensitivity of an analytical method is the smallest amount of analyte that the instrument is able to measure O The sensitivity of an analytical method is the response of the instrument to human error O The sensitivity of an analytical method is a measure of ability to determine whether slight differences in experimental results are significant

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter7: Statistical Data Treatment And Evaluation

Section: Chapter Questions

Problem 7.12QAP

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Which of the following statements is true of the detection limit of an instrument? O The detection limit of an instrument is the same as its sensitivity. O The detection limit of an instrument is a measure of ability to determine whether slight differences in experimental results are significant. O The detection limit of an instrument is the smallest amount of analyte that the instrument is able to measure. O The detection limit of an instrument is the ability of the instrument to respond to an error. Previous Next
The exact mass of the analyte in a given experiment must have to be determined. What quantitative analytical method should be used? O Gravimetric O Volumetric O Spectroscopic O Electroanalytical
3) For the results, discuss the significance of the following in terms of accuracy or precision: a) Deviation vs Absolute Error. b) % Error vs Standard Deviation.
In analytical chemistry, what is a standard method? Include any sources you used to answer this question. Give an example of a standard method, and the reference for it. 2.
Which of the following sentence is correct: O Random errors cause outliers O Random error affects the accuracy of the results O Personal errors result from carelessness and the limitation of the experimenter O Bias measures the random error associated with any analysis OStandard deviation is used to describe the systematic error
A new analytic instrument is capable of detecting picogram quantities of a chemi-cal substance. How many times more capable is this instrument than one that candetect nanogram quantities of the same chemical?
2. Quantitative analysis student Analytical analyzed an ore sample for its lead content and obtained a mean of 4.75% Pb for five measurements. If the certified true value is 4.50%, what is the (a) percent error? (b) percent accuracy?
An analysis of a sample containing mercury was performedusing a standard procedure and a new procedure. The samplewas analyzed 6 times by the new procedure and 8 times by thestandard procedure resulting in standard deviations of 0.355 and0.524 for the new and standard procedures, respectively. If thepooled standard deviation for the data was 0.66 and thetabulated F value at the 95% confidence level was 4.88, Thefollowing statement(s) are true:Select one or more:A. The calculated F value is 2.179B. We are confident that there is no significant statisticalC. difference between the results of the two methodsD. There is no significant statistical difference between theprecision of the two methodsThe calculated F value is 3.216
1. Research on the limitation of accuracy of the following instruments: • analytical balance • top-loading balance • serological pipette • graduated cylinder • burette • volumetric flask • Erlenmeyer flask • beaker 2. Define the term, "measurement uncertainty". Among the instruments listed above, which ones have the highest uncertainty? Which ones have the lowest? 3. Based on the measurement uncertainty of the above instruments, which instruments would yield the lowest percent error?
What is a standard deviation in analytical chemistry?
Which of the following errors are determinate errors? Personal errors. Method errors. O Random errors.
A powder was prepared containing 3.00% NaCN and 97.00% NaCl. A sample obtained from that mixture containing 7.374×10^5 particles weighs 10.0 g. Determine the number and percent relative standard deviation of NaCN particles from a sample of the mixture weighing 6.30 g. I need nNaCN particles and %RSD