What is the difference between hypothesis, thesis statement and research goal? Can someone explain the difference between hypothesis, thesis statement and research goal based on an example?
I had this same question recently and did some research on it. The definitions I found weren't consistent, but from them I derived the following.

Thesis statement -- A definitive statement about the way the world (or your system of interest) works, especially what is most important in causing or influencing the behavior of the system.


  "Family expectations has primary significance on the performance in college for Latino girls in the Western US" is an example of a thesis statement.


Research goal -- Expresses what you hope to learn or shed light on in your research.  Specifically, the goal should specify what type of results you are hoping to achieve. It contextualizes your work in relation to other research, especially theory.  It also feeds into your choice of method.


  "My research goal is to develop a theoretical model of cultural influence on college performance, contextualized by gender and ethnicity" is an example of a research goal.


Hypotheses -- What specific conditions or relations do you aim to test or evaluate in your research.  Any research that does not include a method for hypothesis testing should not claim to test hypotheses. A hypothesis statement must be specific enough that it is testable by the methods you choose, and also it should be falsifiable -- i.e. it is clear what evidence might prove the hypothesis false, and such evidence should be plausible and possible.


  "Low family expectations has a detrimental effect on the college completion rate and time-to-complete for high-achieving Latino girls" is an example of a hypothesis statement.


Notice how there are specific, testable conditions and metrics -- "college completion rates" and "time-to-complete".  These conditions should appear as metrics in your research methods -- i.e. instruments and analysis methods.