(a)
Interpretation:
The standard deviation and relative standard deviation for count 100 are to be determined.
Concept introduction:
The standard deviation can be calculated as follows:
Also, the relative standard deviation can be calculated as follows:
(b)
Interpretation:
The standard deviation and relative standard deviation for count 850 are to be determined.
Concept introduction:
The standard deviation can be calculated as follows:
Also, the relative standard deviation can be calculated as follows:
(c)
Interpretation:
The standard deviation and relative standard deviation for count 8.00×103 are to be determined.
Concept introduction:
The standard deviation can be calculated as follows:
Also, the relative standard deviation can be calculated as follows:
(d)
Interpretation:
The standard deviation and relative standard deviation for count 4.00×104 are to be determined.
Concept introduction:
The standard deviation can be calculated as follows:
Also, the relative standard deviation can be calculated as follows:
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Principles of Instrumental Analysis
- Trial Mass (g) 1 48.8839 2 49.0099 3 49.1121 4 48.9342 5 49.0338 6 48.7798 Calculate mean and standard deviation in the correct number of sigfigsarrow_forwardA 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)arrow_forwardCalculate the standard deviation of the four trials below. Trial 1: 49.59 grams Trial 2: 51.25 grams Trial 3: 49.78 grams Trial 4: 50.19 gramsarrow_forward
- A solution is prepared by weighing 5.0000 g of cesium iodide into a 100-mL volumetric flask. The balance used has a precision of 0.2 mg reported as a standard deviation, and the volumetric flask could be filled with a precision of 0.15mL also reported as a standard deviation. What is the estimated standard deviation of concentration (g/mL)?arrow_forwardA 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%?arrow_forwardGive the standard deviation of these three molaritys. 0.0366 0.0373 0.0370arrow_forward
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