Use the Confidence Level and Sample Data to Find a Confidence

question 25

Multiple Choice

Use the confidence level and sample data to find a confidence interval for estimating the population µ. Round your answer to the same number of decimal places as the sample mean.
-39 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 29.9 pounds and a standard deviation of 3.0 pounds. What is the 95% confidence interval for the true mean weight, µ, of all packages received by the parcel service?

• A) 28.7 lb < µ < 31.1 lb
• B) 29.0 lb < µ < 30.8 lb
• C) 29.1 lb < µ < 30.7 lb
• D) 28.8 lb < µ < 31.0 lb

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Definitions:

Monthly Basis

A timeframe or calculation done once every month or for each month.

Round Answers

A mathematical procedure of adjusting the figure to the nearest desired value or precision, often in calculations or data presentations.

Finance Charge

The total cost of borrowing, including interest and other fees.

Previous Balance

The amount of money that was owed at the end of the previous billing period before any new charges were added.