1. An analytical procedure has a 95% confidence interval of ±0.06%. If a 90% con

Question

1. An analytical procedure has a 95% confidence interval of ±0.06%. If a 90% confidence limit of ±0.06% is required by a regulatory agency, could this procedure still be used?

2. A method for the determination of chloride tested on pure NaCl gave the following results for a series of standard NaCl solutions:

      NaCl weighed (g)             NaCl found (g)

            None                           0.0022

            0.1000                         0.1023

            0.3927                         0.3960

            0.8295                         0.8311

            1.2976                         1.3005

Is there error in the experimental method? If so, please succinctly describe the type of error involved.

Explanation / Answer

1. Yes, the procedure could still be used as the confidence obtained is more than as required for the regulatory agency.

2. Yes, there is an error in measuring the weight. We find the mass of NaCl to be 0.0022g when the NaCl weighed was 0. This type of error is called zero error.

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