# Making since of a graph

1.
View attachment instructionsaj1.bmp
here is what I've obtained

Data:

View attachment dataaj1.bmp

3.

Increasing (με) (μin/in) and decreaseing (με) (μin/in) are both STRAIN
[Increasing σ (psi)] and decreaseing σ (psi) are both STRESS]

My question is. From the directions above, is it asking for a plot of Stress vs Strain or a Stress-Strain curve. And in either case. How many. Should I pool all the data together for one plot or for two? Or is it asking for both a plot and a curve?

further down it asks for: "use data from the most linear portion of the curve to calculate Modulus of the alloy using the following stress-strain equation (recall that the Modulus is the slope of the linear portion of the stress-strain curve, so the equation is the slope of a line)

To me this says to use a stress-strain curve. But why did it ask for a stress vs strain plot? I've spent way too long trying to interpret the directions.
1. Homework Statement

2. Homework Equations

3. The Attempt at a Solution