Search
- Filter Results
- Location
- Classification
- Include attachments
- https://chem.libretexts.org/Courses/Lakehead_University/Analytical_I/5%3A_Standardizing_Analytical_Methods/5.4%3A_Linear_Regression_and_Calibration_CurvesIn a single-point external standardization we determine the value of kA by measuring the signal for a single standard containing a known concentration of analyte. Using this value of kA and ...In a single-point external standardization we determine the value of kA by measuring the signal for a single standard containing a known concentration of analyte. Using this value of kA and the signal for our sample, we then calculate the concentration of analyte in our sample. With only a single determination of kA, a quantitative analysis using a single-point external standardization is straightforward.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/05%3A_Standardizing_Analytical_Methods/5.06%3A_Using_Excel_and_R_for_a_Linear_RegressionThe page details methods for performing linear regression analysis using Excel and R. It explains how to fit a straight-line model to data, obtain relevant statistical information, and visualize the r...The page details methods for performing linear regression analysis using Excel and R. It explains how to fit a straight-line model to data, obtain relevant statistical information, and visualize the regression model using Excel. Three approaches in Excel include using built-in functions, employing Data Analysis ToolPak, and programming formulas directly into a spreadsheet.
- https://chem.libretexts.org/Courses/Saint_Marys_College_Notre_Dame_IN/CHEM_122-02_(Under_Construction)/1%3A_Review_from_CHEM_121/1.02%3A_Uncertainty_in_MeasurementMeasurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible re...Measurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible results); they may be both accurate and precise; or they may be neither accurate nor precise. The goal of scientists is to obtain measured values that are both accurate and precise.
- https://chem.libretexts.org/Workbench/OpenStax_Chemistry_Remixed%3A_Clovis_Community_College/01%3A_Essential_Ideas_of_Chemistry/1.05%3A_Measurement_Uncertainty_Accuracy_and_PrecisionQuantities can be exact or measured. Measured quantities have an associated uncertainty that is represented by the number of significant figures in the measurement. The uncertainty of a calculated val...Quantities can be exact or measured. Measured quantities have an associated uncertainty that is represented by the number of significant figures in the measurement. The uncertainty of a calculated value depends on the uncertainties in the values used in the calculation and is reflected in how the value is rounded. Measured values can be accurate (close to the true value) and/or precise (showing little variation when measured repeatedly).
- https://chem.libretexts.org/Courses/University_of_Georgia/CHEM_3212%3A_Physical_Chemistry_II/03%3A_Quantum_Review/3.1%3A_The_Schr%C3%B6dinger_Equation_and_a_Particle_in_a_Box/3.1.08%3A_The_Uncertainty_Principle_-_Estimating_Uncertainties_from_WavefunctionsThe operators x and p are not compatible and there is no measurement that can precisely determine both x and p simultaneously. The uncertainty principle is a consequence of the wave property of ma...The operators x and p are not compatible and there is no measurement that can precisely determine both x and p simultaneously. The uncertainty principle is a consequence of the wave property of matter. A wave has some finite extent in space and generally is not localized at a point. Consequently there usually is significant uncertainty in the position of a quantum particle in space.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/15%3A_Developing_a_Standard_Method/15.1%3A_Optimizing_the_Experimental_ProcedureDeveloping a standard method requires optimizing multiple aspects. Using the terminology of statisticians, we call the solution’s absorbance the system’s response. Hydrogen peroxide and sulfuric acid ...Developing a standard method requires optimizing multiple aspects. Using the terminology of statisticians, we call the solution’s absorbance the system’s response. Hydrogen peroxide and sulfuric acid are factors whose concentrations, or factor levels, determine the system’s response. To optimize the method we need to find the best combination of factor levels. Usually we seek a maximum response, but sometimes, such as minimizing an analysis’s percent error, we are looking for a minimum response.
- https://chem.libretexts.org/Workbench/Pick_Your_Poison%3A_Introduction_to_Materials_Toxicology/05%3A_Measurement_Uncertainty_Accuracy_and_PrecisionQuantities can be exact or measured. Measured quantities have an associated uncertainty that is represented by the number of significant figures in the measurement. The uncertainty of a calculated val...Quantities can be exact or measured. Measured quantities have an associated uncertainty that is represented by the number of significant figures in the measurement. The uncertainty of a calculated value depends on the uncertainties in the values used in the calculation and is reflected in how the value is rounded. Measured values can be accurate (close to the true value) and/or precise (showing little variation when measured repeatedly).
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/05%3A_Signals_and_Noise_(TBD)When we try to calibrate an analytical method or to optimize an analytical system, our ability to do so successfully is limited by the uncertainty, or noise, in our measurements and by background sign...When we try to calibrate an analytical method or to optimize an analytical system, our ability to do so successfully is limited by the uncertainty, or noise, in our measurements and by background signals that interfere with our ability to measure the signal of interest to us. In this chapter we will consider how we characterize noise, example of sources of noise, and ways to clean up our data by decreasing the contribution of noise to our measurements and by correcting for the presence of backgr
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/03%3A_Measurements/3.14%3A_Measurement_UncertaintyThis page discusses how police identify criminals through witness descriptions, focusing on the inherent uncertainty in measurements like height due to the quality of tools and the skill of the measur...This page discusses how police identify criminals through witness descriptions, focusing on the inherent uncertainty in measurements like height due to the quality of tools and the skill of the measurer. It emphasizes that precise tools, such as rulers with detailed markings, can improve measurement accuracy and reduce uncertainty, highlighting their significance in effective assessments.
- https://chem.libretexts.org/Courses/University_of_Missouri/MU%3A__1330H_(Keller)/01._Introduction%3A_Matter_and_Measurement/1.5%3A_Uncertainty_in_MeasurementMeasurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible re...Measurements may be accurate, meaning that the measured value is the same as the true value; they may be precise, meaning that multiple measurements give nearly identical values (i.e., reproducible results); they may be both accurate and precise; or they may be neither accurate nor precise. The goal of scientists is to obtain measured values that are both accurate and precise.
- https://chem.libretexts.org/Courses/Nassau_Community_College/General_Chemistry_1/01%3A_Essential_Ideas_of_Chemistry/1.05%3A_Measurement_Uncertainty%2C_Accuracy%2C_and_PrecisionQuantities can be exact or measured. Measured quantities have an associated uncertainty that is represented by the number of significant figures in the measurement. The uncertainty of a calculated val...Quantities can be exact or measured. Measured quantities have an associated uncertainty that is represented by the number of significant figures in the measurement. The uncertainty of a calculated value depends on the uncertainties in the values used in the calculation and is reflected in how the value is rounded. Measured values can be accurate (close to the true value) and/or precise (showing little variation when measured repeatedly).
