QUESTION 7

1. In a study of 420,095 Danish cell phone users, 135 subjectsdeveloped cancer of the brain or nervous system (based on data fromthe Journal of the National Cancer Institute as reportedby US Today). The claim is that cell phone users developcancer of the brain or nervous system at a rate that is greaterthan the rate of 0.034% (0.00034) for people that do not use cellphones.

   Use this information to answer this question and the next five(5) questions.

   The 95% confidence interval for the true population proportionof cell phone users who develop brain or nervous system cancers is(lower confidence limit bound, upper confidence limit bound ).

QUESTION 8

1. What can you conclude by comparing the 95% Confidence Intervaland the rate of cancer of the brain or nervous system for non-cellphone users? Justify your answer.

QUESTION 9

1. In performing a formal test of hypothesis to determine if theuse of cell phones increases the rate development of the brain ornervous system cancers, the form hypotheses are:

   		Ho: Pu = 0.00034; Ha: Pu ≠ 0.00034
   		Ho: Pu = 0.00034; Ha: Pu > 0.00034
   		Ho: Pu > 0.00034; Ha: µ <0.00034
   		Ho: Pa = 0.00034; Ha: Pa ≠ 0.00034

QUESTION 10

1. Using the cell phone brain and nervous system cancer rateinformation from above, find the appropriate critical standardnormal z-value for performing the test of hypothesis.

QUESTION 11

1. Perform the formal test of hypothesis and obtain the z-calcvalue to see if using cell phones increases the rate of thedevelopment of the brain or nervous system cancers using theinformation from above.

QUESTION 12

1. Compare z-critical and z-calc and draw the appropriateconclusion for this test of hypothesis. Justify your answer.