The National Assessment for Educational Progress measured the percentage of eighth grade students
The National Assessment for Educational Progress measured the percentage of eighth grade students who were proficient in reading and the percentage of students who graduated from high school in each state in the U.S. The results for the ten most populous states are as follows:
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The National Assessment for Educational Progress measured the percentage of eighth grade students
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Reading
State
Proficiency
Graduation Rate
California
60
75
Texas
73
74
New York
75
65
Florida
66
65
Illinois
75
79
Pennsylvania
79
83
Ohio
79
80
Michigan
73
73
Georgia
67
62
North Carolina
71
73
a. Construct a scatterplot of graduation rate (y) versus reading proficiency (x). Which state is an outlier?
b. Compute the least-squares line for predicting graduation rate from reading proficiency, using the data from all ten states.
c. Remove the outlier and compute the least-squares line, using the data from the other nine states.
d. Is the outlier an influential point? Explain.
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