Identify the correct statement or statements concerning stat

Identify the correct statement or statements concerning statistical testing. In a Gaussian distribution, 75.0% of data points lie within plusminus1 standard deviation of the mean The degrees of freedom used to calculate a pooled standard deviation is equal to the number of data points minus the number of independent sets of replicate data. The F-test determines whether two sets of data have significantly different means. The method of standard additions compares the analyte\'s signal to that of a proxy compound added to the sample in a known concentration. requires the composition of the matrix to be precisely known and carefully duplicated assumes a linear response and a zero y-intercept in a theoretical matrix in which analyte is absent. produces acceptable results even if the ionic strength varies between standards.

Solution

I) false because the gaussina distribution is a normal distribution , and we know that between mean +/-1 SDthere are 68.3 % of the data points

II) true df = n1 + n2 - 2

III) False

F test determines different variances

The method of standard additions:

produces acceptable results even if the ionic strength varies between standards