The USPost Office Is Interested in Estimating the Mean Weight of of Packages

question 143

Multiple Choice

The U.S.Post Office is interested in estimating the mean weight of packages shipped using the overnight service.They plan to sample 300 packages.A pilot sample taken last year showed that the standard deviation in weight was about 0.15 pounds.If they are interested in an estimate that has 95 percent confidence,what margin of error can they expect?

• A)Approximately 0.017 pounds
• B)About 0.0003 pounds
• C)About 1.96
• D)Can't be determined without knowing the population mean.

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Definitions:

Distributive Property

A property indicating that multiplying a sum by a number gives the same result as multiplying each addend by the number and then adding the products.

Principal Investment

The initial amount of money invested, before any earnings or interest.

Simple Interest

A method of calculating the interest charge on a loan or financial investment based on the initial principal and a fixed interest rate over time.

Interest Rate

The proportion, typically expressed as a percentage, at which interest is charged on a loan or paid on savings.