Problem 1) A fractional factorial design has been used to study on the effect of 3 parameters including adsorbent concentration (300 and 500 ppm), pH value (4 and 10) and reaction time (6 and 12 hours) on the adsorption capacity of a composite for removing of methylene blue from a wastewater. If the results obtained for two repetitions of the tests are according to the following table, it is desirable: A) Design Resolution Y₁ Y₂ Run (mg/g) (mg/g) B) Drawing graphs of the effect of each parameter on the adsorption capacity 1 28 26 2 36 34 C) Analysis of interactions 3 18 20 D) Calculate the effects percentage of each parameter and error 4 32 30 E) Determining the optimum conditions to achieve the highest adsorption capacity