The working curve for the determination of dopamine at a nanoneedle electrode by differential-pulse.

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.

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(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.

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