I am writing a paper to find the relationship between motivation and the comfort level in learning English. I prepared a questionnaire with two sets of questions (one for motivation and one for comfort level using Likert scale) to find the relationship between the two. I collected data from 64 participants. Then in order to find the correlation between them, for each participant, I summed up their motivation and comfort level scores in order to have two total scores, one for motivation and one for comfort level for each participant. Now, my question is why I should sum them up? what if I take scores for each question separately? what are the pros and cons of each method? Also could you please introduce a source so I can learn more about it.
Thank you in advance for your help