exp 1 graphs - force through the origin?

[robert zellmer]

A couple of people have asked whether the lines on the graphs should be
forced through the origins. I think I covered this in a previous e-mail so
hopefully this is just a reminder.

You should understand they should go through the origin, since if the mass
is zero the volume should be zero and vice versa.  However, you shouldn't
force them through the origin (this can be  done in Excel and you will do it
for one of the graphs later in the semester).  The fact the y-intercept 
doesn't
go through the origin tells you something (what type of error you may 
have).

Dr. Zellmer
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