Question

Many ancient tombs were cut from limestone rock that contained uranium. Since most such tombs are not​ well-ventilated, they may contain radon gas. In one​ study, the radon levels in a sample of 12 tombs in a particular region were measured in becquerels per cubic meter left parenthesis Bq divided by m cubed right parenthesisBq/m3. For this​ data, assume that x overbarxequals=3 comma 6603,660 Bq divided by m cubedBq/m3 and equals=1 comma 2011,201 Bq divided by m cubedBq/m3. Use this information to​ estimate, with 95​% ​confidence, the true mean level of radon exposure in tombs in the region. Interpret the resulting interval. The confidence interval is left parenthesis nothing comma nothing right parenthesis . ​(Round to the nearest integer as​ needed.)

Interpret the interval. Select the correct choice below and fill in any answer boxes to complete your choice. ​(Round to the nearest integer as needed. Use ascending​ order.)

A. With nothing​ % ​confidence, the true variance of radon exposure in tombs in the region is between nothing and nothing Bq divided by m cubed.

B. With nothing​ % ​confidence, the expected level of radon exposure for the next tomb examined in the region is between nothing and nothing Bq divided by m cubed.

C. With nothing​ % ​confidence, the true mean level of radon exposure in tombs in the region is between nothing and nothing Bq divided by m cubed.

D. With nothing​ % ​confidence, the true mean level of radon exposure in tombs in the region is exactly nothing Bq divided by m cubed. Click to select and enter your answer(s) and then click Check Answer.

Answer 1