Which of the following sentence is correct: O Gross errors result from carelessness and the limitation of the experimenter O Random error affects the accuracy of the results Gross errors cause outliers O Standard deviation is used to describe the systematic error O Bias measures the random error associated with any analysis

Which of the following sentence is correct: O Gross errors result from carelessness and the limitation of the experimenter O Random error affects the accuracy of the results Gross errors cause outliers O Standard deviation is used to describe the systematic error O Bias measures the random error associated with any analysis

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter8: Sampling, Standardization, And Calibration

Section: Chapter Questions

Problem 8.8QAP

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‏he variance of chemical experimentdata is square of standard deviation. tru or false
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9. The following are three sets of data for the atomic mass on antimony (Sb) from the work of Willard and McAlpine. Set 1 Set 2 Set 3 121.771 121.784 121.752 121.787 121.758 121.784 121.803 121.765 121.765 121.781 121.794 a) Determine the mean and standard deviation of each data set. b) Determine the 95% confidence intervals for each data set. c) Determine whether the 121.803 value in Set 1 is an outlier for that set. d) Pool the data and determine the overall mean and the pooled standard deviation. e) Compare the overall mean of the 11 data points with the currently accepted value. Report the absolute error and the percent relative error, assuming the currently accepted value is the true value.
A clinical chemist obtained the following data for the alcohol content of a sample of blood: % C2H5OH: 0.084, 0.089, and 0.079. Calculate the 95% confidence interval for the mean assuming that (a) the three results obtained are the only indication of the precision of the method and that (b), from previous experience on hundreds of samples, we know that the standard deviation of the method s 5 0.005% C2H5OH and is a good estimate of s.
Bi th 60 OC to th its CC St sp he ca el th kr pc in di of F re re ap sti ne pr el up CC W ne th C( el er If ho W Sp m lo Average and standard deviation based on "Using the Balance" Data pt. Deviation, (di) (x; -m) Xi 2 3 1 4 i sum Mean: Standard Deviation: i Average and standard deviation based on "Measuring the volume of water transferred" Data pt. Xi 2 3 1 10.065 mL 10.036 mL 9,793 mL 9.992 mL 4 5 55.858 55.858 55.858 55.858 sum Mean: Standard Deviation: Deviation, (di) (Xi — m) Square of di (x; -m)² -16- Square of di (Xi — m)2 CLOR