What Cronbach's alpha range is generally recommended for internal consistency?

What Cronbach's alpha range is generally recommended for internal consistency?

• A. 0.50-0.70
• B. 0.70-0.90
• C. 0.90-1.00
• D. 0.30-0.60

Answer: (B)

Cronbach's alpha measures internal consistency, i.e., how well the items on a scale hang together by tapping the same underlying construct. For most research contexts, an alpha in the 0.70–0.90 range is considered acceptable-to-good: it signals that items are reliably related without being so similar that they're essentially repeating the same question. Values below 0.70 suggest insufficient shared variance among items, while values above 0.90 raise concern that items may be redundant and not contributing new information. So the recommended range is 0.70–0.90.

Cronbach's alpha measures internal consistency, i.e., how well the items on a scale hang together by tapping the same underlying construct. For most research contexts, an alpha in the 0.70–0.90 range is considered acceptable-to-good: it signals that items are reliably related without being so similar that they're essentially repeating the same question. Values below 0.70 suggest insufficient shared variance among items, while values above 0.90 raise concern that items may be redundant and not contributing new information. So the recommended range is 0.70–0.90.