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6) Cosmic radiation levels rise with increasing altitude, promoting researchers to consider how pilots and flight...

6) Cosmic radiation levels rise with increasing altitude, promoting researchers to consider how pilots and flight crews might be affected by increased exposure to cosmic radiation. A study reported a mean annual cosmic radiation dose of 219 mrems for a sample of flight personnel of Xinjiang Airlines. Suppose this mean is based on a random sample of 100 flight crew members. Let s = 35 mrems.

Calculate and interpret a 90% confidence interval for the actual mean annual cosmic radiation exposure for Xinjiang flight crew members

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