Researchers at the US Department of Agriculture’s Food Safety Lab contaminated i
ID: 2908933 • Letter: R
Question
Researchers at the US Department of Agriculture’s Food Safety Lab contaminated identical sponges with bacteria and then randomly assigned each to one of the following methods of disinfecting them: microwaving for one minute on high, washing them via a dishwasher cycle, soaking them in 10% bleach for three minutes or soaking in lemon juice or water for one minute. After the disinfectant procedure, the number of bacteria remaining was measured. Which of the following is true of this experiment?
Because the plain water soak is not a disinfection method, it is a placebo
This is a randomized block experiment, with five blocks
There are five treatments
The factor in this experiment is the number of bacteria present
A.Because the plain water soak is not a disinfection method, it is a placebo
B.This is a randomized block experiment, with five blocks
C.There are five treatments
D.The factor in this experiment is the number of bacteria present
Explanation / Answer
A.True
B.False.This is a Completely randomised Design
C.True.
D.False.No of bacteria present are the Response variable
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