Given a shaky economy and high heating costs, more and more households are struggling to pay utility bills (The Wall Street Journal, February, 14, 2008). Particularly hard hit are households with homes heated with propane or heating oil. M any of these households are spending twice as much to stay w arm this winter compared to those who heat with natural gas or electricity. A representative sample of 500 households was taken to investigate if the type of heating influences whether or not a household is delinquent in paying its utility bill. The following table reports the results.
At the 5% significance level, test whether the type of heating influences a household's delinquency in payment. Interpret your results.