The Average Natural Gas Bill for a Random Sample of 26

question 8

Multiple Choice

The average natural gas bill for a random sample of 26 homes in the 19808 zip code during the month of March was $305.30 with a sample standard deviation of $46.50. The margin of error for a 98% confidence interval around this sample mean is -----.

• A)$25.20
• B)$22.66
• C)$18.69
• D)$20.15

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Definitions:

Secreted

The process by which substances are produced and discharged from a cell, gland, or organ for a particular function in the organism or for excretion.

Darkness

The absence of light in an environment, affecting visibility and perception.

Circadian Rhythms

Biological processes that display an endogenous, entrainable oscillation of about 24 hours.

Earth's Rotation

The spinning of the Earth on its axis, which takes approximately 24 hours to complete, resulting in day and night.