38. Given a shaky economy and high heating costs, more and more households are struggling to pay u t ility bills (The Wall Street Journal, February, 1 4 , 2008). Particularly hard h it are households with homes heated with propane or heating oil. Many o f these households are spending twice as much to stay warm this w in te r compared to those who heat w ith natural gas or electricity. A representative sample o f 500 households was taken to investigate if the type o f heating influences w he ther or not a household is delin quen t in paying its u tility bill. The fo llowin g table reports the results.

Delinquent in Payment?

Type of Heating Natural Gas Electricity Heating Oil Propane Yes 50 20 15 10 No 240 130 20 15 At the 5% significance level, test whether the type o f heating influences a household's delinquency in payment. Interpret your results.