Hypothesis incorrectly stated and submitted I realise after submitting my dissertation lask week that I posed my hypothesis in the wrong manner.

I posed them as 


  I believe that X will not be a predictor of Y


I subsequently went on with results which returned a p value of 0.01 and subsequently said we reject the null throughout my discussion.

It may be simply viewed as a typo. Am I likely to suffer greatly as a result of this mistake. I proceed with my methods, data analysis and discussion as if the hypotheses are proposed in the correct manner and given the overall premise of the dissertation and explanation of the result, it's quite clear what I am trying to achieve I believe.

Am I likely to simply be failed as a result of this error?

Any help greatly appreciated as I'm very as this has been submitted  and I am extremely worried
I'm hoping to be correct here, but this depends partially on personalities. Since you found the error, you should immediately inform everyone involved of the error and offer to supply a corrected version immediately. If people are reasonable they should act reasonably, of course. If you wait, and someone else notices it, you will have difficulties. 

Getting things absolutely backwards is likely more common than you imagine. Also, when you write and then proofread your own writing, you are very likely to see what you want to see, what you think you wrote, rather than what you actually wrote. Most reasonable people will recognize that, have a bit of a chuckle and move on. 

But you have to be the one to raise the flag. 

You raise this issue on a week end. If at all possible, don't wait for the new week to inform at least your professor. 



One of the reasons that books have editors and journals assign reviewers is to catch these kind of errors of inattention. Sometimes an advisor will perform that function for a student, but not always.