The standard deviation in a method for the analysis of CO2 in air has been found

Question

The standard deviation in a method for the analysis of CO2 in air has been found to be 0.53

ppm (from extensive experience).

a) What is the 95% confidence interval of a measured value of 389.44 ppm?

b) If the method is modified and the standard deviation of the improved method is measured

to be 0.72 ppm (N=4), what is the confidence interval if the sample gives an identical

measured value of 389.44 ppm? What would you suggest to improve the results?

c) If a sample of air is measured using the new method and found to contain 388.22 ppm CO2,

is this sample statistically different from the first?  

Explanation / Answer

The standard deviation in a method for the analysis of CO2 in air has been found

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