Appl Of Ms Excel In Analytical Chemistry
2nd Edition
ISBN: 9781285686691
Author: Crouch
Publisher: Cengage
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Which of the statements below are TRUE regarding the mean and standard deviation?
I As the number of measurements increases, x approaches u 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.
O land I
Il and II
O , Ill and IV
O Ill and IV
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: 0.3205%, 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.
Consider the following sets of replicate measurements:
Calculate the mean and the standard deviation for each of these six data sets. Calculate the 95% confidence interval for each set of data. What does this interval mean?
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- . Consider the data result in determining the presence of copper has a mean value of 50 mg and coefficient of variation is 4%. What is the standard deviation?arrow_forwardTrial 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 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? samplesarrow_forward
- Location 1 (% C) To determine the organic material in a dried lake bed, the percent carbon by mass is Sample Location 2 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 (% C) 60.40 60.10 are different. 60.20 60.90 For each location, calculate the standard deviation and report it with two 60.30 60.20 significant figures. 4 60.40 60.70 60.20 60.30 location 1 standard deviation: location 2 standard deviation: What is the calculated F vae for comparing the standard deviations? Fale = Are the standard deviations for the two locations significantly different at the 95% confidence level? O no O yes What is the calculated i value used to compare the means of these two locations? I cale = Are the means for the two different locations significantly different at the 95% confidence level? O no O yes tv huluarrow_forwardYou pipette and weigh a 100 ml sample of water & get the following results for 3 trials: 0.1041g, 0.0979g, 0.0998g. calculate average, % error, mean (or average) deviation, standard deviation, and % deviationarrow_forwardAssuming that an experiment's results are 10.1, 10.4 and 10.6, find the mean, the average deviation from the mean and the standard deviation. You can use Excel to verify your calculation. Use the editor to format your answerarrow_forward
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