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CHEM1057 - Assignment 2 report template

Use this template to report your results. Do not modify the template. Reporting correct values with an inappropriate number of significant figures will be marked as zero. Marks will only be awarded for reporting the correct values with the appropriate number of significant figures and showing the corresponding calculations in the Excel spreadsheet. 

Question 1. Obtain, for each glucose concentration, the confidence interval at a 95% confidence level (CL). Report confidence intervals as     [18 marks]

Question 2. Estimate the number of samples that would be required to obtain a relative uncertainty, s_r, in the measurement of the standard solutions better than 5%. Illustrate this estimation only for a glucose concentration of 15 mM. Report the value of the predicted relative uncertainty in percentage and round it to show only one decimal place. [10 marks]

Question 3. Build a calibration curve of current vs. concentration, using the mean value of current for each concentration and use the confidence interval for the error bars. Include the linear fit and corresponding equation in the calibration plot (as calculated as explained in question 4). [27 marks]

[9 marks for correct plot with appropriate axis labelling, 9 marks for correct error bars, 9 marks for linear fit with equation with appropriate number of significant figures]

Insert plot here.

Question 4. Perform a linear regression using all the experimental data points, report the confidence interval of the slope and intercept at a 95% confidence level and report the standard deviation of the regression. [15 marks]

Question 5. Use the results of the linear regression to estimate the concentration of the unknown sample and the associated error. Do not use the worst-case scenario to estimate the error. [20 marks]

Question 6. Estimate the limit of detection (LOD) of the method considering that the measurements of standard solutions with zero glucose concentration have the same standard deviation as the lowest glucose concentration reported above. Report your estimated LOD with a precision of one decimal place. [10 marks]

Proofread your answers making sure you have reported the results correctly from Excel to the template. When finished, save the template as a PDF document and upload it in e-assignment with your Excel spreadsheet. Make sure you upload the spreadsheet as an Excel file.