Question

The working curve for the determination of dopamine at a nanoneedle electrode by differential-pulse voltammetry (Figure 25-38) was constructed from the following table of data.

$\begin{array}{cc}\begin{array}{l}\text{Concentration}\\ \text{Dopamine,}\mathbf{}\mathbf{mM}\end{array}& \text{Peak Current,}\mathbf{nA}\\ 0.093& 0.66\\ 0.194& 1.31\\ 0.400& 2.64\\ 0.596& 4.51\\ 0.991& 5.97\end{array}$

(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 2.92 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.

Short answer

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Step-by-step solution

Step 1. Given

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