Multiple Choice
The average natural gas bill for a random sample of 21 homes in 19810 zip code during the month of March was $311.90 with a sample standard deviation of $51.60. The 90% confidence interval around this sample mean is ________.
A) [$285.98, $337.82]
B) [$292.48, $331.32]
C) [$278.09. $345.71]
D) [$266.82, $356.98]
Correct Answer:
Verified
Correct Answer:
Verified
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