The working curve for the determination of dopamine at a nano needle electrode by differential-pulse voltammetry (Figure 25-38) was constructed from the following table of data.
(a) Use Excel to perform a least-squares analysis of the data to determine the slope, intercept, and regression statistics, including the standard deviation about regression.
(b) Use your results to find the concentration of dopamine in a sample solution that produced a peak current of 3.62 nA. This value is the average of duplicate experiments.
(c) Calculate the standard deviation of the unknown concentration and its 95% confidence interval assuming that each of the data in the table was obtained in a single experiment.
