Help! Comparing Likert Scale Variables with Dummy Variable

[ptmarkova]

Hello,

I have conducted a survey, which consisted 5 questions about buying impulsiveness. The five questions are based on likert scale. The dummy variable is If the respondents have purchased daily deal before or not. I want to see if the impulsiveness in online shopping has positive influence on daily deal purchasing. I don't know how I can compare all 5 questions with the dummy variable or should I do them separately?

Thank you!
Petya