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# Use the following to answer the questions below:On August 8, 2012, the national average price for a ...

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Use the following to answer the questions below:

On August 8, 2012, the national average price for a gallon of regular unleaded gasoline was $3.63. The prices for a random sample of gas stations in the state of Illinois were recorded at that time. The mean price for the sampled gas stations was$3.975, with standard deviation \$0.2266. A boxplot of the data is provided.

Construct a 95% confidence interval for the mean gas price in Illinois (on August 8, 2012). Round your margin of error to three decimal places.

▸ 3.813 to 4.137

▸ 3.807 to 4.143

▸ 3.822 to 4.128

▸ 3.791 to 4.159
Textbook

## Statistics: Unlocking the Power of Data

Edition: 3rd
Authors:
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dmp7474dmp7474
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