# Effects of Strategy and Rule Complexity on Multivariable Inductive Judgments

- Corinne Zimmerman,
*Illinois State University*
- Steve Croker,
*Illinois State University*

## Abstract

We investigated the effects of strategy use and rule complexity on
multivariable inductive judgments. Participants (N=274) made judgments about
which of two cars presented on a computer screen was faster. Participants were
randomly assigned to a complex rule or a simple rule. For the complex rule, three
of five variables affected speed; for the simple rule one variable affected
speed. Participants were instructed to make explicit (try to discover the rules
governing speed) or implicit (speeded intuitive) judgments for 300 trials with
feedback.
A 2 (complexity) x 2 (strategy instruction) ANOVA revealed main effects of
complexity, F(1,270)=6.17, p=.014, and task instruction, F(1,270)=11.69, p=.001,
and a significant interaction, F(1,270)=7.38, p=.007. The explicit strategy led
to better performance for the simple rule only, but no differences were found for
the implicit strategy. These findings run counter to recent work showing an
advantage for implicit processing of complex rules (Zimmerman & Pretz, 2012).

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