A Random Sample of 16 Roundtrip Flights Between Philadelphia and Dallas

Multiple Choice

A random sample of 16 roundtrip flights between Philadelphia and Dallas has an average airfare of $422.10 with a sample standard deviation of $56.30. The 98% confidence interval around this sample mean is --------.

A) ($385.48, $458.72)
B) ($415.06, $429.14)
C) ($400.99, $443.21)
D) ($365.80, $478.40)