For the results of an experiment to be truly reliable, a. the sample groups must be different enough to account for errors in the data

B. better should only be collected on only the factors that have shown a reaction

C. The data must be exactly what the hypothesis is predicted

B. The experiment must be repeated several times with similar results

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.