How do you write a hypothesis?  What is it?  How do you come up with a good hypothesis? 

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What is a hypothesis?

How do you write a hypothesis?  What is it?  How do you come up with a good hypothesis?   Is it a guess? No.

A hypothesis is sometimes described as an educated guess, which is not the same thing as a guess, for example;

If you put an ice cube on a plate and place it on the table, what will happen?  Some people might guess it will still be there in a couple of hours.  However most people would agree with the hypothesis:

An ice cube will melt in less than 30 minutes.

As a researcher you could watch the ice cube melt thinking you have proved the hypothesis but some critical steps would have been missed.

A good study requires you to do quite a bit of research before any testing.  First, start by finding information about how and why water melts by reading journal articles, books, internet searches or talk to experts. Learn about how temperature and air pressure changes the state of water and don’t forget elevation above sea level changes air pressure too.

Now, using all this research, try to restate the hypothesis:

An ice cube will melt in less than 30 minutes in a room at sea level with a temperature of 20C or 68F.

Is this correct?  A question to ask could be, what is the ice made from?  What if the ice cube was made from salt water or you added salt to a regular ice cube?  More research may be required.  Would adding salt make a difference?  Would other chemicals change the melting time?

Given this additional information how would our hypothesis be written now?

An ice cube made with tap water will melt in less than 30 minutes in a room at sea level with a temperature of 20C or 68F.

Does that seem like an educated guess?  No, it sounds like you are stating the obvious, however it is obvious only because of the research you conducted.  Now you need to carry out the testing to prove the hypothesis.

Therefore a hypothesis isn’t an educated guess, it is a tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation.

Once you do the testing and prove the hypothesis, it becomes part of scientific theory.