The density of kerosene is 0.810 g/mL and was measured using a hydrometer with a standard deviation of ±0.015. Calculate the volume and propagate the error if the mass of the kerosene is 1.67 g.
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The density of kerosene is 0.810 g/mL and was measured using a hydrometer with a standard deviation of ±0.015. Calculate the volume and propagate the error if the mass of the kerosene is 1.67 g.
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- Molarity trail 1 0.0366 trail 2 0.0373 trail 3 0.0370 Calculate the standard deviation. Calculate the Relative Standard deviation of molarity to 3 sig figs.A method for the detection of morphine is used to generate a calibration curve in which the assay response (y) is plotted versus morphine concentration (x, in mg/L). This gives a straight line with a slope (m) of 0.241 and a y-intercept (b) of 0.011, where y = mx + b. The slope of this line has a standard deviation of ±0.007, and the standard deviation of the intercept is ±0.006. If the sample from an athlete gives a response of 0.506 ± 0.013 in this method, what is the concentration of morphine in the sample and estimated precision of this concentration?A volumetric calcium analysis on samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.10, 3.08, 3.28, 3.15, 3.26, 3.12, 3.14, 3.18, 3.25, 3.11, 2.95. Calculate: Mean Standard deviation Coefficient of variation What is the 95% confidence interval for the mean of the data, assuming no prior information about the precision of the analysis? Apply the Q test to the following data sets to determine whether the outlying result should be retained or rejected at the 95% confidence level. ( work on the first measurements according to your case)
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- 1. A student performed this experiment and obtained the following concentration values: 0.02813 M, 0.02802, and 0.02788 M a. what is the mean concentration? b. what is the standard deviation of these results? 3. how would the following errors affect the concentration of Cl- obtained in question 2b? give your reasoning in each case. a. the student read the molarity of AgNo3 as 0.02104M instead of 0.02014M b. the student was past the endpoint of titration when he took the final buret reading.Which of the statements below are TRUE regarding the mean and standard deviation? I. As the number of measurements increases, x̄ approaches μ if there is no random error.II. The square of the standard deviation is the average deviation.III. The mean is the center of the Gaussian distribution.IV. The standard deviation measures the width of the Gaussian distribution.What is the relation between the standard deviation and the precision of a procedure? What is the relation between standard deviation and accuracy?
- A quantitative analysis for an analyte gives a mean concentration of 12.6 ppm. The standard deviation due to the method, sm, is found to be 1.1 ppm, and that due to sampling, ss, is 2.1 ppm. By how much does the overall variance change if sm is improved by 10% and ss is improved by 15%?Normality of a solution was determined by five different titrations. The results were 9.5 mL, 8.5 mL, 9.1 mL, 9.3 mL, and 9.1 mL. Calculate the mean, median and standard deviation of this dataApproximately 15% of the particles in a shipment of silver-bearing ore are judged to be argentite (d=7.3 g/cm^3, 87% Ag); the remainder are siliceous (d=2.6 g/cm^3) and contain essentially no silver. a. Calculate the number of particles that should be taken for the gross sample if the relative standard deviation due to sampling is to be 2% or less. b. Estimate the mass of the gross sample, assuming that the particles are spherical and have an average diameter of 3.5 mm.
