Question

Suppose the U. S. Environmental Protection Agency (EPA) would like to investigate the relationship between the engine sizes of sedans and the miles per gallon (MPG) they get. The following table shows the engine size in cubic liters and rated miles per gallon for a selection of 2013 sedans. These data can also be found in the Excel file EPA.xlsx.
a. Calculate the Spearman rank order correlation coefficient.
b. Using a = 0.05, perform a hypothesis test to determine if the population rank correlation coefficient is less than zero.


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  • CreatedJuly 29, 2015
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