It is known that the tensile strength of a plastic increases as a function of the time it is heat treated. The following data are collected:
Time | 10 | 15 | 20 | 25 | 40 | 50 | 55 | 60 | 75 |
Tensile Strength | 5 | 20 | 18 | 40 | 33 | 54 | 70 | 60 | 78 |
(a) Fit a straight line to these data and use the equation to determine the tensile strength at a time of 32 min.
(b) Repeat the analysis but for a straight line with a zero intercept
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