Is my thesis statement good? This is for my senior project and my topic is interior design.
Although one must have formal education to make a career as an interior designer, one can successfully decorate his own home without such formal training or education with the tools provided through media.
In addition to the excellent advice provided in the first answer, I would like to add that your thesis sentence sounds a little stiff. You use the pronoun "one" twice and then switch to "his." Actually, I suspect you are probably thinking "her," that is, of a woman learning to decorate her own home, but are trying to keep the sentence abstract or general. Also, the media can furnish all kinds of information but it can't provide you with tools (although it can undoubtedly advertise a lot of tools). I would suggest you write the sentence more or less as follows:
Although a formal education in interior design is mandatory to pursue a professional career in the field, it is possible to decorate one's own home successfully without such elaborate training by using the information and advice provided by the media.
I hope this is helpful. I suggest that you might define which media you are talking about. If you mean television and magazines, it might be better to say television and magazines. I'm sure your essay will be more specific about which media the do-it-yourselfer should consult.
This thesis statement is not bad at all. Your goal is to persuade people that your thesis is cogent. For you to do this, you will need reasons for this. The better your reasons are, the better your thesis and paper will be. So, I would suggest the following.
First, make sure that you have at least three good reasons why your thesis statement is true. You mention "tools" for decorating your own home from media. What are these and if you can give examples, it would be better. If you can make reference to a self-made decorator, that would be even better.
Second, you might want to make one of your supporting points the fact that no one knows their own decoration taste better than that person. So, there is good reason why a person with an eye for decoration (through media) not to decorate his or her own home. I will link a resource about interior design.