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