Hi, please help me
I was trainee with J1 from Jan1-Dec1, then my status was changed from J1 to J2 Dec1-Dec31. My country has tax treathy with US. As I know there is no tax treathy for J2. My question is can I have tax treathy for the period being on J1 visa? Thanks.

Yes.

Thank, one more question, I have income from saving account, what type of income is this? Effectively connected or not connected with a US trade? (I am a non-resident). Thank

For Non residents bank interest is not taxable income.