The solubility of an unknown liquid was measured 4 times. The average solubility is 0.05897 mL/mL and the standard deviation is 0.0027 mL/mL. How should those values be reported? O 0.05897±0.0027 O 0.0590±0.0027 0.059±0.0027 0.05897±0.003
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- A method for the determination of the corticosteroid methylprednisolone acetate in solutions obtained from pharmaceutical preparations yielded a mean value of 3.7 mg mL with a standard deviation of 0.3 mg mL. For quality control purposes, the relative uncertainty in the concentration should be no more than 3%. How many samples of each batch should be analyzed to ensure that the relative standard deviation does not exceed 9% at the 95% confidence level? samplesDr. Caras was characterizing a cytochrome (an iron containing protein) from a new strain of bacteria. He obtained eight measurements of the percent iron in the protein: 0.5806%, 0.5804%, 0.5796%, 0.5794%, 0.5919%, 0.5795%, 0.5805%, and 0.5793%. Calculate the mean (x) and standard deviation (s) for these results. x = 0.5812 2.84 X10-3 Incorrect Use the Grubbs test to determine if of these values is an outlier. What is the value of Gcalculated? Gcalculated 0.494 Incorrect Should this potential outlier be rejected with 95% confidence? Critical values of G can be found in this table. O The potential outlier should be rejected. The potential outlier should be kept. % % ро en uti si lutiThe analysis shows different concentrations based on replicate determinations of Zn in a water sample: 0.754 mg, 0.721 mg, 0.734 mg, 0.731 mg and 0.742 mg. What is the absolute error if the standard solution has 0.750 mg of Zn?
- [References) A method for the determination of the corticosteroid methylprednisolone acetate in solutions obtained from pharmaceutical preparations yielded a mean value of 3.7 mg mL with a standard deviation of 0.3 mg mL. For quality control purposes, the relative uncertainty in the concentration should be no more than 3%. How many samples of each batch should be analyzed to ensure that the relative standard deviation does not exceed 9% at the 95% confidence level? samplesDr. Caras was characterizing a cytochrome (an iron containing protein) from a new strain of bacteria. He obtained eight measurements of the percent iron in the protein: 0.4908%, 0.4902%, 0.4899%, 0.4899%, 0.5012%, 0.4891%, 0.4903%, and 0.4892%. Calculate the mean (x) and standard deviation (s) for these results. x = S= Use the Grubbs test to determine if one of these values is an outlier. What is the value of Gcalculated? Gcalculated = % %Dr. Caras was characterizing a cytochrome (an iron containing protein) from a new strain of bacteria. He obtained eight measurements of the percent iron in the protein: 0.2409%, 0.2404%, 0.2394%, 0.2399%, 0.2515%, 0.2393%, 0.2409%, and 0.2392%. Calculate the mean (x) and standard deviation (s) for these results. % S = Use the Grubbs test to determine if one of these values is an outlier. What is the value of Galculated? Gcalculated = Should this potential outlier be rejected with 95% confidence? Critical values of G can be found in this table. The potential outlier should be rejected. The potential outlier should be kept.
- A titrimetric method for the determination of calcium in limestone was tested with the analysis of a NIST limestone containing 30.15% CaO. The mean of the four analyzes is 30.26% CaO with a standard deviation of 0.085%. From the data accumulated from many analyzes, s→ϭ=0.094% CaO was found.a) Do the data indicate the presence of systematic error at the 95% confidence level?b) When a value for ϭ is unknown, do the data show a systematic error at the 95% confidence level?Standard deviation 0.6318 mL, 0.1216 mL, 0.1056 mL, 0.0681 mL, 0.0056 mL Mean-0.18654 mLDr. Caras was characterizing a cytochrome (an iron containing protein) from a new strain of bacteria. He obtained eight measurements of the percent iron in the protein: 0.3205%, 0.3202%, 0.3196%, 0.3198%, 0.3316%, 0.3197%, 0.3208%, and 0.3197%. Calculate the mean () and standard deviation (s) for these results. x = Use the Grubbs test to determine if one of these values is an outlier. What is the value of Gealeulated? Gcalculated = Should this potential outlier be rejected with 95% confidence? Critical values of G can be found in this table. The potential outlier should be kept. The potential outlier should be rejected.
- 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)?A group of students titrate a calcium carbonate standard solution repeatedly in five experimental trials. Based on the five trials, the group determines that the average concentration of the standard is 80.5 ppm with a standard deviation of 0.5 ppm. Using the equation for the Student's t confidence interval found in Appendix 1 of your lab manual and the t-value for a 95% confidence interval, calculate the confidence interval for which there is a 95% chance of finding the "true value" of the standard solution's concentration based on the data. Put your answer in the format # lower limit < "true value" < # upper limit. (Appendix 2 has an example that may be helpful.)To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two different locations. To compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations are different. Location 1 standard deviation: 0.050 Location 2 standard deviation: 0.34 What is the calculated ? value for comparing the standard deviations?