The Process of Analyzing Data for a Field Study

I've done data analysis before. Heck, I was a research assistant for a Child Psychologist for years. But, I'll admit I'm rusty. How many pieces of data is enough? Am I looking for things that aren't there? Am I trying to make my data match the studies I've read? That's when concerted, peer reviewed analysis comes in handy. Funny I should comment on peer reviews because that's what I'm asking my students to do. They must write, edit and peer review each other's work. And what am I hoping to discover you might ask? I am hoping to see improvement in the thought processes, conventions and overall quality of writing by my grade 6 and 7 students. A lot to ask? Well, I don't think so. One of the initial pieces of data that is assisting me with my field study question is a survey on writing and editing using the computer. My belief was that most, if not all students would prefer typing to using paper and pencil. The majority did, but there was one student who was just mediocre(score of 5). I don't really know why this is true, but my hunch is that he just likes having a pencil in his hand. He is an artist and would prefer to draw all day if he could. The other interesting thing I noted from the data is that three of my very outgoing students were the ones who did not want their writing to be peer edited. They stated that they are very private and don't like other people reading their work. Because I can see who responded to the survey in my Sharepoint site, I have decided to speak to these girls personally and perhaps ask them to edit each other's work.