a) Find a 90% confidence interval for the population mean weight of the fall lobsters…

Radon is a colorless gas that is naturally released by rocks and soils and may concentrate in tightly closed houses. Because radon is slightly radioactive, there is some concern that it may be a health hazard. Radon detectors are sold to homeowners worried about their risk, but the detectors are sold to homeowners worried about their risk, but the detectors may be inaccurate. University researches placed 12 detectors in a chamber where they exposed to 105 Pico curies per liter of radon over 3 days. Here are the readings given by the detectors: 91.9 97.8 111.4 122.3 105.4 95.0 103.8 99.6 96.6 119.4 104.8 101.7 Assume (unrealistically) that you know that the standard deviation of readings for all detectors of this type is =9. (Yates, Moore & McCabe, the practice of statistics, p.555) a) Give a 90% confidence interval for the mean reading µ for this type of detector.

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