Before explaining that, understand what an argument is can be helpful. Arguments can be expressed in just one sentence or they can extend over an entire book. They can be easy to follow or difficult to follow. They can be trivial or important. They can be full of mistakes or perfect. But one thing is certain!
The structure of an argument consists of two parts:
(1)
a claim: some statement of fact or opinion; the point of what’s being said; this point is usually called the
conclusion.
(2)
support for the claim: evidence or reasons related to the claim in such a way as to endorse it or make it acceptable; these supporting lines of reasoning are usually called
premises.
Before you can effectively evaluate an argument, you need to understand what kind of argument is being offered. Philosophically,
arguments have been divided into two types:
deductive arguments and
inductive arguments. But I leave them aside for your self-discovery.
The word “
hypothesis” derives from the Greek work
hupotithenai meaning ‘to propose or to speculate.’ The fundamental process of hypothesis is to speculate about an underlying cause-effect relationship. By itself, an hypothesis is nothing more than a speculative knowledge proposition formed on the basis of incomplete information, without evidence and reasoning.
On the contrary, the word “
inference” has two meanings. One conveys the process of inferring something or drawing logical conclusions from premises known or generally accepted to be true, whereas the other technically signifies a conclusion reached on the basis of evidence and reasoning. To which are you referring?

I'll try and read it again later after I finish my geography revision..
Btw, since hypothesis is formed without evidence and reasoning, does it means that I can write something false?
Let's say the experiment is about friction, can I write the hypothesis as "The rougher the surface the lesser the frictional force" ??