What does the thermal expansion lab data reveal?

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tavskitavski
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Homework Statement
Everything written below and in attached files.
Relevant Equations
Equations also in attached files.
So guys I had physics lab where we used Steam Generator, Pasco interface and Capstone. In a nutshell there is graph attached below and formula, please write the solution with this formula.
 
Attachments
  • Printed problem 3: Find the coefficient of expansion of the rod α and its uncertainty using the equation α = Δl / (ΔT l).
    Formula.PNG
    3.8 KB · Views: 193
  • Screenshot of a graph window with a box reading Linear, mT + b, m = -0,0178 ± 3,7x10^-5, b = 0,446 ± 0,0019, r = -0,989; two blue data traces slope downward across the grid.
    IMG_2500.JPG
    100.1 KB · Views: 183
  • Text fragment defining symbols: "where ΔT represents the change in temperature, l represents a particular length measurement, and Δl - a change in length measurement with the change in temperature."
    definition.PNG
    2.6 KB · Views: 197

Discussion

I could not understand, that is why I posted. Please I really need your help
 

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