Finding Equation for Two Dataset Relationships

[Analysis]

Dear all,
I want to find functional relationship between two datas set.How to find,it relation is linear,exponential,logarthemics,polynomial functions in terms of equation format.(any ref.material regarding this would be useful)

Dataset
0.5° 121.20
5° 123.02
10° 125.04
15° 127.06
20° 129.07

Thanks in advance
Prakash

 

[Office_Shredder]

Eyeballing it, it looks exceedinly linear

 

[madphysics]

I agree, but the first and last data points are off.

 

[madphysics]

Do you have any other values? That would be helpful.

 

[Office_Shredder]

Honestly, the first data point is off by something like .01 per five degrees...

the second data point isn't even off considering the significant digits involved (2.02/5 degrees = .202/.5 degrees, so the first one should be 121.202, but it's rounded)

 

[madphysics]

Yeah, you're right. I graphed it as basically linear, besides those points. So the equation is n=121+2.02d if d is equal to the degrees at fives.