In this chapter, I report 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 (accentedness, comprehensibility, fluency and confidence) are reported in separate sections below. Readers who are unfamiliar with intermediate-level statistics for psychology may find the technical detail in this chapter challenging. Although reading Chapter 9 will enhance the reader’s understanding of the discussion in Chapter 10, the main findings of the statistical analyses are also summarized and discussed in Chapter 10, and the implications of those findings are discussed in Chapter 11.