A biologist is currently studying two different types of bacteria. She believes

Question

A biologist is currently studying two different types of bacteria. She believes that introducing the types of bacteria to an organic system, like the human body, may cause that system to react in a particular way that will help fight off general infections.

A test is conducted where 180 Petri dishes are collected and are treated to the bacteria according to the following table:

In each Petri dish, the biologist extracts and measures the amount of a particular kind of infection-fighting agent (IFA) that is present. The amount of IFA present is an indication of how well the system can fight off infections.

Below is the means plot corresponding to the data gathered in this study:

The following table presents three statements relating to this means plot. For each statement, select whether it is true or false.

Bacteria A Total No dose Small dose Large dose Bacteria B No dose 20 20 20 60 Small dose 20 20 20 60 Large dose 20 20 20 60 Total 60 60 60 180 Bacteria B --- No dose --Small dose -Large dose IFA No dose Large dose Small dose Bacteria A

Explanation / Answer

a) For the means plot, there is does not exist visibledifference in the means as we increse the dosages of bacteria A indicating that there is a no significant effect of Bacteria B on the presence of IFA. FALSE

b) For the means plot, there is large difference in the means as we increse the dosages of bacteria B indicating that there is a significant effect of Bacteria B on the presence of IFA. TRUE

c) There does exist the interaction effects visible in the plot. TRUE

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