Can there be 2 types of measure in one questionnaire?
For example, both a 5-point Likert scale and a 7-point Semantic Differential are used in a single questionnaire.
If I were to compare the mean, should it be interpreted according to individual scale?
Background: In my questionnaire, respondents need to evaluate Website A and Website B whereby the constructs were assessed as follows: Question 1 - 24 were 7-point Semantic Differential Scale Question 25 - 48 were 5-point Likert Scale In my analysis, I applied Independent Sample T-test. I want to compare the mean values between respondents who evaluated Website A and respondents who evaluated website B. Being a newbie, I found that might be because I am combining 2 types of measurement scale in a single questionnaire. Is such a practice correct?