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And how can i found out if the site has the keyword i looking for Optimized????

Here is a question,
if i have a keyword that have over 150.000 searches/Month and the competitors are very low, but if i give the keyword on google search, the site that are listed at top 10 have a Page Rank from 2 to 5, or even 8.
How can i know if the Page Rank from this sites, have to do with the keyword i wont to optimized? Does the Page Rank have effect to the top 10 Ranking, even if this sites are not specially optimized for this keyword.
A example:
www.amazon.de has a PR 8, they sell Books. If i wont to Optimized for a specially book Category, do i can compare to the amazon? or because the Central Page has a PR8, it does have effect on all the under-sites by Amazon, and it will be to difficult to Optimized for this? even if the Searches for the special category are a lot and google keyword says the competitors are low?

How can i see if the PR has to do with the keyword, or the site just have this kind of PR without being specialized for the keyword i look after?

thanks for all
stavros