A company has tried to improve the effectiveness of its dishwashing detergent and wants to see if it works better than the original formula. They use 6 identical new dishwashers and load them identically with dirty dishes.
Three packs of each of the two types of detergent are used, and they are randomly assigned to one of the six dishwashers. After the load is run, they rate each load for overall cleanliness. Which of the following is true?
A) Blinding is impossible in this experiment because they must be able to see the dishes.
B) The explanatory variable is the different dishwashers.
C) Because each brand is used in three dishwashers, replication is used properly.
D) A control group with no detergent at all is needed.
E) The response variable is the type of detergent.
Question 2
Does Procellera Antimicrobial Wound Dressing help injuries heal faster? Researchers checked records of 38 patients who had been treated for acute or chronic wounds between 2010 and 2012.
They found that those who had been treated with Procellera healed almost twice as fast. This is a
A) matched experiment
B) prospective study
C) retrospective study
D) survey
E) randomized experiment
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