Table 5 Ranks and test statistics of Mann–Whitney U test for lexical variation.

From: Lexical richness in Chinese university students’ EFL writing: a corpus-based comparison

Index

Group

N

(Mean) Mean rank

Mann–Whitney U

Z

Asymp. Sig. (2-tailed)

Effect size r

CTTR

EFL

400

(5.627) 230.07

11,828.50

−14.07

0.000a

0.57

ENL

200

(7.123) 441.36

LWV

EFL

400

(0.704) 311.34

35,664.00

2.17

0.030

0.09

ENL

200

(0.679) 278.82

  1. aDifference is statistically significant at the level of 0.025 after Bonferroni Correction.
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