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CHAPTER 11 Analysis of variance with more than one IV 339
Figure 11.5 Line graph illustrating the interaction between revision conditions and exam conditions IVs
Figure 11.6 Graphs illustrating no interactions between variables
compared with those who did so in the exam hall. In fact we have the opposite pattern of
means in these two conditions. An example from the research literature would be the fi nding
that highly anxious individuals tend to direct their attention to negative stimuli in the environment,
whereas non-anxious individuals direct attention away from negative stimuli (Mogg and
Bradley, 1999). Here there is an interaction between the anxiety variable and the attention
variable. A useful way of seeing whether you have an interaction between two variables is to
generate line graphs. Take a look at the graphs illustrated in Figure 11.6.
Figure 11.6 shows that, when there is no interaction between two variables, the lines that
represent the exam conditions variable are parallel. When we observe such parallel lines we