Chronbachs alpha

Question 1

Cronhach’s alpha

Answer 1

Used to measure internal consistency

-Assesses the extent to which all items in a measure consistently measure the construct

Question 2

Results

Answer 2

• produces a value between 0-1
• less than 5 = unacceptable
• 5-6 = poor
• 6-7 = questionable
• 7-8 = acceptable
• 8-9 = good
• over 9 = excellent

Question 3

which test to use for

Answer 3

• Use for homogeneous tests
• Use when you intend to combine a group of items into a total score
• Report separately for multidimensional scale

Question 4

Output

Answer 4

-Inter-item correlation matrix: Correlation coefficient indicates internal consistency
-Item total statistic table: Corrected item total correlation (remove items below 0.3)
Cronbachs alpha if item deleted: overall alpha if item deleted

Question 5

Uses

Answer 5

• refine scale

- Assess internal validity