Validating ESL Speaking Instrument for Vocational College Students: An Exploratory Factor Analysis
Table 5: Rules of Thumb of Cronbach’s Alpha (George & Mallery, 2003)
Alpha Value | Level |
>0.90 | Excellent |
0.80-0.90 | Good |
0.70-0.80 | Acceptable |
0.60-0.70 | Questionable |
0.50-0.60 | Poor |
<0.50 | Unacceptable |