The average natural gas bill for a random sample of 21 homes in the 19808 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) (292.46, 331.34)
B) (285.98, 337.82)
C) (278.09, 345.71)
D) (266.82, 356.98)
Question 2
A recent study reported that 73 of Americans could only converse in one language. A random sample of 130 Americans was randomly selected. What is the probability that 100 or fewer of these Americans could only converse in one language?
A) 0.6389
B) 0.7510
C) 0.8413
D) 0.9245
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