Here's some good advice:

1. Stop thinking of attraction in terms of numerical values. Phenomenon is right; either your attracted or you are not. Either she is attracted or she isn't.

2. Stop rating women in terms of attractiveness numerixally. Either you think she is attractive or you don't. There is no 4's, 7's or 10's - this is a terrible way to think and will do you more harm than good.

Mark is also right, just be natural and honest and forget about all this over the top analysis into things. Interactions with woman are meant to be a normalsocial process, not a science paper.