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5. Results of 50 determinations of nitrate ion concentration, in g ml-1, are shown below: 0.51 0.51 0.51 0.50 0.51 0.49 0.52 0.53 0.50 0.47

5. Results of 50 determinations of nitrate ion concentration, in g ml-1, are shown below:

0.51 0.51 0.51 0.50 0.51 0.49 0.52 0.53 0.50 0.47

0.51 0.52 0.53 0.48 0.49 0.50 0.52 0.49 0.49 0.50

0.49 0.48 0.46 0.49 0.49 0.48 0.49 0.49 0.51 0.47

0.51 0.51 0.51 0.48 0.50 0.47 0.50 0.51 0.49 0.48

0.51 0.50 0.50 0.53 0.52 0.52 0.50 0.50 0.51 0.51

a) Calculate the 95% and 99% confidence intervals of the mean for the nitrate ion concentration measurements.

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