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Table 8 Results of post hoc analysis using Tamhane test for multiple comparisons among groups in the TOEFL iBT test

From: A quantitative analysis of TOEFL iBT using an interpretive model of test validity

(I) obs.test.score

(J) obs.test.score

Mean difference (I–J)

Sig.

Strongly disagree

Disagree

− 1.39048

.944

Undecided

− 2.97078

.149

Agree

− 4.51891*

.008

Strongly agree

− 6.68214*

.000

Disagree

Strongly disagree

1.39048

.944

Undecided

− 1.58030

.308

Agree

− 3.12843*

.001

Strongly agree

− 5.29167*

.000

Decidedun

Strongly disagree

2.97078

.149

Disagree

1.58030

.308

Agree

− 1.54813

.185

Strongly agree

− 3.71136*

.001

Agree

Strongly disagree

4.51891*

.008

Disagree

3.12843*

.001

Decidedun

1.54813

.185

Strongly agree

− 2.16324

.126

Strongly agree

Strongly disagree

6.68214*

.000

Disagree

5.29167*

.000

Undecided

3.71136*

.001

Agree

2.16324

.126

  1. Sig = 0 < α = 0.05
  2. *The mean difference is significant at the 0.05 level