The Average Natural Gas Bill for a Random Sample of 26

Multiple Choice

The average natural gas bill for a random sample of 26 homes in the 19808 zip code during the month of March was $305.30 with a sample standard deviation of $46.50. The margin of error for a 98% confidence interval around this sample mean is -----.

A) $25.20
B) $22.66
C) $18.69
D) $20.15