Type of Tip 1234 1 9.3 9.4 9,2 9.7 2 9.4 9.3 9,4 9,6 Specimen 3 9.6 9.8 9.5 10.0 4 10.0 9.9 9.7 10.2 a) Is there any difference in hardness measurements between the tips? b) Use the graphical method from Section 5-8.1 to investigate specific differences between the tips. c) Analyze the residuals from this experiment.

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A: Given that  if x=4,8,3,-2

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A: Let's find.

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A:

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A: i have provided this answer in step-2.

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A:

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A: Given,            -24

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A:

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A: f(x)= x2-5x+4x2-4x              = x2-4x-x+4x(x-4)               = x(x-4)-1(x-4)x(x-4)…

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A: