Refer to the Lincolnville School bus data. Develop a regression equation that expresses
the relationship between age of the bus and maintenance cost. The age of the
bus is the independent variable.
a. Draw a scatter diagram. What does this diagram suggest as to the relationship between
the two variables? Is it direct or indirect? Does it appear to be strong or weak?
b. Develop a regression equation. How much does an additional year add to the maintenance
cost. What is the estimated maintenance cost for a 10-year-old bus?
c. Conduct a test of hypothesis to determine whether the slope of the regression line is
greater than zero. Use the .05 significance level. Interpret your findings from parts (a),(b), and (c) in a brief report.
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