Multiple regression output from Minitab for the PAH data of Exercise 53 in the previous section included

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Multiple regression output from Minitab for the PAH data of Exercise 53 in the previous section included the following information:
Unusual Observations
Multiple regression output from Minitab for the PAH data of

What does this suggest about the appropriateness of using the previously given fitted equation as a basis for inferences? The investigators actually eliminated observation #7 and re-regressed. Does this make sense?

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