Question
A local electronics firm wants to determine their average daily sales (in dollars.) A sample of the sales for 25 days revealed an average sales
A local electronics firm wants to determine their average daily sales (in dollars.) A sample of the sales for 25 days revealed an average sales of $139,000. Assume that the standard deviation of the population is known to be $12,000.
| a. | Provide a 88.3% confidence interval estimate for the true average daily sales. |
| b. | Provide a 99.9% confidence interval estimate for the true average daily sales. |
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Algebra And Trigonometry Enhanced With Graphing Utilities (Subscription)
Authors: Michael Sullivan, Michael Sullivan III
7th Edition
0134273842, 9780134273846
