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 margin of error for a 90% confidence interval around this sample mean is -----.
A) 22.9
B) 14.1
C) 10.6
D) 17.2
Correct Answer:
Verified
Correct Answer:
Verified
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