A hypothesis is an educated guess and as such must have the following characteristics:

Question

1) can be proved or disproved



2) is based on some previous evidence



3) is an unsubstiantiated thought



4) is the basis of psychological research



5) all of the above



6) 1, 4



7) 1, 2, 4

Answer 1

Rather than "proved or disproved," I would say "supported or contradicted."

http://www.psychologytoday.com/blog/the-scientific-fundamentalist/200811/common-misconceptions-about-science-i-scientific-proof

I would say 4.