Which test of reliability to use?

#1
Hi,

I am unsure of if I am to use different tests of reliability for different types of data sought by the same questionnaire, or if one test may be applicable to all of my data? I have a mixture of nominal and interval data.

When testing the data using Alpha my results came back very low but the questionnaire I am using was provided by my university and so cannot be changed.

Thanks a lot for any help!