# How to interpret two types of measurement scale in a single questionnaire?

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?

• I would consider making the title of your question a little bit more descriptive. – Patrick Coulombe Dec 7 '15 at 17:11
• Can you be more specific? I'm having trouble imagining a case where comparing the mean of a question that would be asked on the Likert scale vs one that would be asked on a semantic differential makes sense. – Jordan Bentley Dec 7 '15 at 20:38
• 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 Im combine 2 types of measurement scale in a single questionnaire. Is such way correct? – zaihasriah Dec 8 '15 at 3:29
• Has everybody answered all 48 questions or are there 24 per website? – David Ernst Dec 18 '16 at 22:00