Table 2. Means (and standard deviations in parentheses) of each speaker’s proficiency score

Group	Speaker ID	Score
Adv	1215	4.78 (0.51)
	1112	4.06 (0.61)
	1216	3.90 (0.70)
	2211	3.80 (0.66)
	Mean	4.12 (0.73)
Low	2212	2.34 (0.70)
	2215	2.31 (0.99)
	2216	2.28 (0.64)
	2118	2.26 (0.73)
	1115	1.93 (0.80)
	Mean	2.22 (0.81)