If I have 4 variables in my multiple regression and I'm told to test whether one is significant, and 3 others are not what would I do with the one left over? I thought it would be easy as I could just test whether for H0: variable 1>0, variable 2,3 =0 But what if I'm told to restrict variable 1 so that under H0 it must =1? If you think about it variable cannot = 1 unless there is no contribution from variable 4 (which I'm told I must "take into account"). This is because my Y variable has a maximum value of 100 and my variable 1 also has a maximum value of 100. By forcing variable=1 I'm saying that the whole of the change in Y is caused by variable 1. But we have already agreed that variable 4 is a contributer. So how do I "take it into account" when building a restricted and unrestricted model? If I exclude variable 4 from both the restricted and unrestricted than variable 1 won't be equal to 1, and if I include it won't be = 1 either!