An experiment was conducted to investigate the effects of the concentrations of sulfuric acid (H2SO4) and calcium chloride (CaCl2) on the amount of black mud precipitate in the treatment of alkaline wastewater. There were three levels of each concentration, and two replicates of the experiment were made at each combination of levels. The relevant statistical analysis is provided in
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An experiment was conducted to investigate the effects of the concentrations of sulfuric
acid (H2SO4) and calcium chloride (CaCl2) on the amount of black mud precipitate in the treatment of
alkaline wastewater. There were three levels of each concentration, and two replicates of the
experiment were made at each combination of levels. The relevant statistical analysis is provided in
the following table: (image)
a) Does there appear to be an interaction between concentration of sulfuric acid and calcium
chloride at the .05 level? What does this say about the additive model?
b) Can the effect of concentration of sulfuric acid on amount of black mud precipitate in the
treatment of alkaline wastewater be described by interpreting the main effects of
concentration of sulfuric acid? If so, interpret the main effects at the .05 level, including the
appropriate test statistic and p-value. If not, explain why not.
c) Can the effect of concentration of calcium chloride on amount of black mud precipitate in the
treatment of alkaline wastewater be described by interpreting the main effects of
concentration of calcium chloride? If so, interpret the main effects at the .05 level, including
the appropriate test statistic and p-value. If not, explain why not.
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