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**Original citation.** Campbell, J.I., & Robert, N.D. (2008). Bidirectional associations in multiplication memory: Conditions of negative and positive transfer. *Journal of Experimental Psychology: Learning, Memory, and Cognition, 34*(3), 546-555. **Target of replication.** We particularly focus on Campbell and Robert’s hypothesis that including both types of arithmetic problems in practice and test phases would allow for facilitative transfer-of-practice to occur, rather than solely multiplication or solely factoring. We seek to replicate their finding of RT savings with an operation change in either direction (multiplication to factoring as well as factoring to multiplication), F(2, 68) = 41.59, p < 0.001. **A priori replication criteria.** A successful replication would find RT savings with an operation change in either direction. The critical effect of interest is the interaction of condition and problem type on the median of log RTs for correct trials. To test this, we plan to conduct a 2 (condition: factor during test phase, multiply during test phase) X 3 (problem type: factored during practice, multiplied during practice, or new) mixed ANOVA on the median of log RTs for correct trials with condition as between subjects factor and problem type as a within subjects factor. If the Mauchly’s sphericity test is significant, this will indicate that the assumption of sphericity underlying the repeated measures ANOVA has been violated. In this case, a correction will be applied to the degrees of freedom for the F-test. If the epsilon for the sphericity test is below .75, the Greenhouse-Geisser correction will be applied. Otherwise, the Huynh-Feldt correction will be applied. A draft of the replication report with more details can be found [here][1]. [1]:
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