Mean, median, etc. Analyst A reported the following percentages of FeO in a sample: 16.65, 16.70, 16.68, 16.60, 16.58, and 16.63. For this set of results calculate (a) the mean, median, range, average deviation, relative average deviation (ppt), standard deviation, and coefficient of variation: (b) the 95% confidence interval of the mean, first from the standard deviation and then from the range.
Calculate (manually) the mean and standard deviation for samples from the top of the lake, and for samples from the bottom of the lake. You may make tables with columns for deviations and squared deviations.
Should the value 26.19 ppm be rejected at 95% confidence?State the null hypothesis, show calculation of the experimental statistic, and show the choice of critical statistic.
What is the 90% confidence interval for [Cl-] at the bottom of the lake?
Find the pooled standard deviation for the chloride analyses in ppm.
Determine if there is a systematic difference between the mean values of the lake-water (top versus bottom) at the 90% confidence level. State the null hypothesis, show the calculation of the test value, and how you chose your statistical value.
Is there homogeneity at the 99% confidence level? Show working with the statistical test.
First, make a calibration curve using only the area of the ethanol peak and the concentrations of the standards. As in Part 1 a and b, prepare and print a calibration curve including the linear least squares equation of the line equation and the R2 value, and print a copy for your report. Also, calculate the concentration of your sample and the uncertainty (95% confidence interval), as well as the uncertainty of the unknown determination on a percentage basis, and include these values in your report. .
Next, make a calibration curve based on the ratio of ethanol area to propanol area and the concentrations of the standards. As in the previous question, prepare and print a calibration curve including the linear least squares equation of the line equation and the R2 value, and print a copy for your report. Also, calculate the concentration of your sample and the uncertainty (95% confidence interval), as well as the uncertainty of the unknown determination on a percentage basis, and include these values in your report. .
At a blood alcohol concentration of 0.08% (w/v) or more a person is considered impaired. Briefly discuss whether the calculated results for the sample in e and f above support criminal charges of impairment.
Report Requirements:
Spreadsheet with graphs and calculations. Prepare separate sheets in one excel file for each of the following:
Data Set 1
Data Set 2
Calibration with external standard
Standard addition with one standard (optional, could submit hand or type written calculation only)
Standard addition with multiple additions
Internal standard peak areas
Internal standard peak area ratios
Print-outs of graphs
Data Set 1
Data Set 2
Calibration with external standard
Standard addition with multiple additions
Internal standard peak areas
Internal standard peak area ratios
Results
Fill in the table below with results from the spreadsheet. Remember to include units.
