A Random Sample of 25 Roundtrip Flights Between Philadelphia and Dallas

Multiple Choice

A random sample of 25 roundtrip flights between Philadelphia and Dallas has an average airfare of $393.50 with a sample standard deviation of $50.30. The 95% confidence interval around this sample mean is ------ .

A) ($353.26, $433.74)
B) ($388.47, $398.53)
C) ($383.44, $403.56)
D) ($372.74, $414.26)