Table 2 Pearson’s product moment correlation of difficulty estimates and perceived difficulty level (vocabulary items)

1. Difficulty estimate vocabulary items (first set)

Pearson

–

.366^**

.485^**

.383^**

Sig. (2-tailed)

.004

.000

.003

2. Perceived difficulty level vocabulary items (first set)

Pearson

–

.444^**

.737^**

Sig. (2-tailed)

.000

.000

3. Difficulty estimate vocabulary items (second set)

Pearson

–

.693^**

Sig. (2-tailed)

.000

4. Perceived difficulty level vocabulary items (second set)

Pearson

–

Sig. (2-tailed)