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Exam (elaborations)

Analytical Chemistry ACS Final Review Questions And Answers Rated A+ New Update Assured Satisfaction

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95% Confidence Interval - ️️(t*s.d.)/ √N t= from table, use degrees of freedom N= # of observations Q test calculation - ️️gap/range You can reject the data if QexpQ90 Error - ️️Difference between accepted and measured value Precision - ️️describes the reproducability of measurements Accuracy - ️️indicates the closeness of the measurements to the true value absolute error - ️️(E)= X:-Xe (measurement- true) relative error - ️️(Er)= (X:-Xe)/Xe Random or indeterminate error - ️️causes data to be scattered around a mean value (affects precision) gross error - ️️often large errors which result from human error

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Institution
Analytical Chemistry ACS
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Analytical Chemistry ACS

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Analytical Chemistry ACS Final
Review Questions And Answers Rated
A+ New Update Assured Satisfaction

95% Confidence Interval - ✔️✔️(t*s.d.)/ √N

t= from table, use degrees of freedom
N= # of observations

Q test calculation - ✔️✔️gap/range

You can reject the data if Qexp>Q90

Error - ✔️✔️Difference between accepted and measured value

Precision - ✔️✔️describes the reproducability of measurements

Accuracy - ✔️✔️indicates the closeness of the measurements to the true value

absolute error - ✔️✔️(E)= X:-Xe (measurement- true)

relative error - ✔️✔️(Er)= (X:-Xe)/Xe

Random or indeterminate error - ✔️✔️causes data to be scattered around a mean
value
(affects precision)

gross error - ✔️✔️often large errors which result from human error

Systematic or determinate error - ✔️✔️causes mean to differ from the true value

instrumental error - ✔️✔️malfunctioning instruments

method errors - ✔️✔️nonideal chemical or physical behavior or analytical systems

personal errors - ✔️✔️carelessness, personal limitations, and reading scales

constant errors - ✔️✔️stay the same as the size of the measured increases
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