I am working on my thesis and I have a survey that has true/false and multiple choice questions. From what I understand, KR20 is used for dichotomous variables to estimate reliability coefficient. Also, if multiple choice questions are not equally weighted, I can use KR20. Am I correct in doing KR20 for both trues/false and multiple choice items? Any suggestions and input is greatly appreciated. If you can suggest references that would be great. Thank you!