4) Consider the following experiment to be analyzed with a two-way ANOVA: Respon

Question

4) Consider the following experiment to be analyzed with a two-way ANOVA: Response variable: number of spruce moths found in deployed traps after 48 hours. Factor 1: Location of trap in tree (four levels: top branches, middle branches, lower branches, ground). Factor 2: Type of lure in trap (three levels: scent, sugar, chemical). Imagine you are particularly interested in those locations and lure types, i.e., you will limit the interpretation of your results to these levels. If so, how can you classify these factors?

a. Both Location and Lure type are fixed factors

b. Both Location and Lure type are random factors

c. Location is fixed and Lure type is random

d. Lure type is fixed and Location is random

Explanation / Answer

The factors can be classified as:

d. Lure type is fixed and Location is random

Fixed effect factor: Data has been gathered from all the levels of the factor that are of interest.

Random effect factor: The factor has many possible levels, interest is in all possible levels, but only a random sample of levels is included in the data.1

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