The amount of pressurization in an airline cabin

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1. Passenger comfort is influenced by the amount of pressurization in an airline cabin. Higher pressurization permits a closer-to-normal environment and a more relaxed flight. A study by an airline user group recorded the corresponding air pressure on 30 randomly chosen flights. The study revealed a mean equivalent pressure of 8,000 feet with a stan- dard deviation of 300 feet.

a. Develop a 99 percent confidence interval for the population mean equivalent pressure.

b. How large a sample is needed to find the population mean within 25 feet at 95 percent confidence?

Reference no: EM131106833

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