1.
You are estimating the precision of a method for analysing neonicotinoid acetamiprid in garlic and tomato. Using data from analysis of spiked garlic and tomato samples, evaluate precision of acetamiprid determination on each day and pooled standard deviation of all series.
NB! Consider the significance of intercept and whether calibration line should be forced through 0.
Data for calculations: 44d_garlic_raw.xls and 44d_tomato_raw.xls
Use spreadsheets or ValChrom software (assessment method: Intermediate precision | 6 injections at target concentration).