From my experience, all US visas require interview, however if you are applying for a travel visa, the interviewer will only ask you some questions like where do you go and how long will you stay. Just take it easy.
For single female, it is probable to have more questions, like what will you do? Where do you live? etc..
If you have been rejected for an application of US visa before or having other risk factors, it would take longer, but for normal person, it would be a really easy process.
Hope it helps.
參考: Personal experience in applying for a J-1 Student Visa