Essay
Circumference and Age Narrative
Evidence supports using a simple linear regression model to estimate the circumference of a pine tree based on its age. Let x be the age of the pine tree (measured in years) and y be the circumference (measured in cm). A random sample of 11 mature pine trees was selected and the following data recorded: The following output was generated using statistical software:
Regression Analysis
The regression equation is
y = -148 + 4.18x S = 4.025 R-Sq = 96.4% R-Sq(adj) = 96.0%
Analysis of Variance Table Unusual Observations
R denotes an observation with a large standardized residual
-Refer to Circumference and Age Narrative. Consider the following normal probability plot of the residuals. What conclusion can be drawn from the plot? Justify your answer.
Correct Answer:

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