ABSTRACT
This chapter discusses the results of the between-group statistical analyses of the performance accuracy and speech production data. The results for the performance variables: navigation accuracy and readback accuracy, and the speech production variables. The main objective of the author's study was to determine whether and to what extent high- and low-proficiency second-language (L2) speakers are affected in their task performance and speech production by high workload involving L2 communication. Because workload was operationalized using a mental arithmetic task, an independent measure of participants' mental arithmetic ability was taken with the objective of accounting for any effects that difference in mental arithmetic ability might have on performance in the concurrent task condition. The participants' scores were submitted to a one-way analysis of variance (ANOVA), which yielded a significant result. The two-way ANOVAs comparing the performance accuracy data in the Workload condition yielded a significant main effect of length for both navigation accuracy and readback accuracy.
