Fire Ants

The following study was designed to evaluate the effectiveness of four chemicals developed to control fire ants. The type of environmental conditions in which the chemical is placed might have an effect of the effectiveness of the treatment to kill fire ants. Thus, the researcher randomly selected five locations from a large selection of locations, each location representing a randomly chosen environment.

The reduce the effect of different colonies of fire ants and the types of mounds they inhabit, the researcher created 40 artificial fire ant mounds and populated them with 50,000 ants having similar ancestry. The researcher randomly assigned two mounds to each of the 20 treatment-location combinations. The number of fire ants (in thousands) killed during a 1-wek period was recorded. Data are available in fireants.sav.

1. Is the chemical a fixed- or random-effects factor? Explain briefly.
   
2. Is location a fixed- or a random-effects factor? Explain briefly.
3. Would you consider location to be a factor or a blocking variable? Explain briefly.
4. Is the design crossed or nested? Explain briefly.
   
   
5. Plot the number of ants killed by location, using a different line for each chemical.
   
   
6. Does the effectiveness of the chemical vary according to location? Explain briefly.
7. How much variation in the effectiveness of the chemicals can be explained by the different locations?
   
   
8. Which chemical(s) would you recommend? Support your answer statistically.

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Solution: The downloadable solution consists of 5 pages, 421 words and 5 charts.
Deliverable: Word Document