Hooke's Law & Forces: Find Force Constant, Slope & % Error

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Hey there, I have a paper on “Hooke’s Law” due in soon and have ran into a few problem’s when writing it, first of dose anyone know...

 How to find force constant?
 How to find slope with units?
 How to find % error?

If you know any of the above, I would deeply appreciate the answer... anyways thanks in advance.
 
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Did you look up any of these?
The questions are quite general and with wide possibilities.

For example in some situations you can find the force constant by reading the label on the spring or the manufacturer manual. You may not be interested in this method but how am I supposed to know?
 
Thanks for the reply, though what I ment to ask was generally how would I find

 Force constant?
 The slope with units?
 The % error?
 

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