Question

3. The fluorescence of each of a series of acidic solutions of quinine was determined five times. The results are given below. Concentration ng mL Fluorescence intensity (arbitrary units) 0 4 10 20 30 60 63 60 63 63 40 75 81 79 78 50 104 109 107 101 105 20 21 46 45 4 21 4 Determine the slopes and the ordinate intercepts of the unweighted and weighted regression lines. Calculate, using both regression lines, the 95% confidence limits for the concentrations of solutions with fluorescence intensities of 15 and 90 units

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Answer 1

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