I have a survey which contains 13 variables in total. For each variable I asked 3 similar questions in order to test the internal consistency.
Now I performed 13 Cronbach's alpha tests, one for each variable, to see whether people filled in the 3 questions per variable on a consistent basis. The results are presented below:
Variables ______________ Cronbachs Alpha ______ Cronbachs alpha if item deleted
Accessibility__________________0.416_______________Not possible to get a higher CA
Accuracy____________________0.680_______________Not possible to get a higher CA
Completeness________________0.681_______________Not possible to get a higher CA
Information Quality_____________0.832_______________Not possible to get a higher CA
Quantity_____________________0.566_______________Not possible to get a higher CA
Understandability______________0.569_______________Not possible to get a higher CA
My questions are the following:
If possible, do I need to delete an item in order to get a higher CA? Or should I only do this when the increase in CA is relatively high?
Can I use all the variable displayed above or are some of them worthless because of the low CA score?