Ideas for Dissertation

I have a few ideas for my dissertation, none of which are set in stone, of course...I am not quite sure how to formulate a good research hypothesis, but the statistics book for 800 is helping me in that direction.

Ok, well, here are some ideas or research questions:

1) To what extent does learning grammar improve ESL students' writing skills? Is there a correlation between the two?

2) To what extent do college students' (not neccesarily those of ESL speakers) perceptions of, and attitudes toward, peer feedback impact their writing performance?

3) To what extent do college students value peer assessment?

4) How does teacher feedback influence bilingual students' perceptions of their writing?

5) Hypothesis: The overall quality of papers by ENC 1102--English Composition 2--students at Miami Dade College who receive tutoring at the Writing Center will be higher than those who do not.

6) To what extent does socioeconomic status affect students' writing performance?

7) To what extent does an ESL learner's native language impact his/her writing?

8) ESL students who learn new words in context, i.e., through reading, will write better essays than those who don't (or those who memorize new words)