Refer to the Radiation Protection Dosimetry (Dec. 2010) study of radon exposure in Egyptian tombs, Exercise 8.64 (p. 398). The radon levels-measured in becquerels per cubic meter (Bq/m3)- in the inner chambers of a sample of 12 tombs are reproduced in the table. Recall that for safety purposes, the Egypt Tourism Authority (ETA) temporarily loses the tombs if the level of radon exposure in the tombs is too high, say, 6,000 Bq/m3. Conduct a nonparametric test to determine if the true median level of radon exposure in the tombs is less than 6,000 Bq/m3. Use a = .10. Should the tombs be closed?

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Radon levels in Egyptian tombs 580 1300 4000 50 910 180 3400 7800 12100 390 11900 1100