> which don't you think interact with each other, > your t-test results should then be valid if the two features are independent. Assuming that your assumptio

> which don't you think interact with each other, > your t-test results should then be valid if the two features are independent. Assuming that your assumption are correct on interaction effect. You can do a hypothesis test on that assumption while including both factors (the two features). Which will clear away any doubt with a 95% confidence or hire a statistician =).