4-34. (a) The linear calibration curve in Figure 4-13 is y = 0.016 30 (+0.000 22) x + 0.004, (0.002,) with s, 0.005,. Find the quan- tity of unknown protein that gives a measured absorbance of 0.264 when a blank has an absorbance of 0.095. Figure 4-13 has n = 14 calibration points in the linear por- tion. You measure k = 4 replicate samples of unknown and find a mean corrected absorbance of 0.169. Find the standard uncertainty and 95% confidence interval for protein in the unknown.

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