Question

A coagulation-microfiltration process for removing bacteria from water was investigated. Chemical engineers at Seoul National University performed a designed experiment to estimate the effect of both the level of the coagulant and acidity (pH) level on the coagulation efficiency of the process. Three levels of coagulant and Three pH level were employed. Water specimens from the Han River in Seoul, Korea, were placed in jars, and each jar was randomly assigned to receive two of the 9 combinations of coagulant level and pH level. What type of experimental design was applied in the study?

Group of answer choices

A. A 3x3 factorial experiment

B. A completely randomized design with 9 treatments

C. A randomized block design with 2 treatments and 9 blocks

Answer 1

Ans :  

A. A 3x3 factorial experiment

( Three levels of coagulant and Three pH level were employed)