A. The spreadsheet below shows the results of two different analytical methods used to determined calcium (Ca) in a standard sample. Method A is the accepted method, and Method B is a newly developed procedure. Method A Method B 20.4 21.0 25.4 23.6 25.1 22.2 22.5 17.8 24.9 24.2 26.2 21.6 (a) find the means of the two methods, the standard deviations and the standard deviations of the means (b) Give the 95% confidence interval for the means of the two methods (c) Do the variances differ at the 95% confidence interval (d) Do the t-test and test the null hypothesis that the two means are equal  at the 95% confidence interval

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