Researchers examined data on the depth of small defects in the Trans-Alaska Oil Pipeline. The researchers compared the results of measurements on 100 defects made in the field with measurements of the same defects made in the laboratory. The figure shows a residual plot for the least-squares regression line based on these data. Explain why the conditions for performing inference about the slope β₁ of the population regression line are not met.

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30 20 10- -10 -20 -30 20 40 60 80 Laboratory measurement Residual