A gas company has determined from past experience that at the end of winter 80% of its accounts are fully paid, 10% are 1 month in arrears, 6% are 2 months in arrears, and 4% are more than 2 months in...

A gas company has determined from past experience that at the end of winter 80% of its accounts are fully paid, 10% are 1 month in arrears, 6% are 2 months in arrears, and 4% are more than 2 months in arrears. At the end of this winter the company checked a random sample of 400 of its accounts, finding 287 to be fully paid, 49 to be 1 month in arrears, 30 to be 2 months in arrears, and 34 to be more than 2 months in arrears. Do these data suggest that the pattern of previous years is not being followed this winter?