Radon exposure in Egyptian tombs. Refer to the Radiation Protection Dosimetry (Dec. 2010) study of radon exposure in Egyptian tombs, Exercise 7.39

(p. 362). The radon levels—measured in becquerels per cubic meter (Bq/m3)—in the inner chambers of a sample of 12 tombs are listed in the table. For the safety of the guards and visitors, the Egypt Tourism Authority

(ETA) will temporarily close the tombs if the true mean level of radon exposure in the tombs rises to 6,000 Bq/m3.

Consequently, the ETA wants to conduct a test to determine if the true mean level of radon exposure in the tombs is less than 6,000 Bq/m3, using a Type I error probability of .10. An SAS analysis of the data is shown on p. 427.

Specify all the elements of the test: H0, Ha, test statistic, p-value,

a, and your conclusion.

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