Eunice Gunterwal is a frugal undergraduate at State U. Who is interested in purchasing a used car. She randomly selected 125 want ads and found that the average price of a car in this sample was $3,250. Eunice knows that the standard deviation of used-car prices in this city is $615
- Establish an interval estimate for the average price of a car so that Eunice can be 68.3 percent certain that the population mean lies within this interval.
- Establish an interval estimate for the average price of a car so that Miss Gunterwal can be 95.5 percent certain that the population mean lies within this interval.
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